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  • 201.
    Alday, Luis F.
    et al.
    Mathematical Institute, University of Oxford, Oxford, U.K..
    Bissi, Agnese
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Perlmutter, Eric
    Walter Burke Institute for Theoretical Physics, Caltech, Pasadena, U.S.A..
    Genus-One String Amplitudes from Conformal Field Theory2019Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 6, artikkel-id 10Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We explore and exploit the relation between non-planar correlators in N=4 super-Yang-Mills, and higher-genus closed string amplitudes in type IIB string theory. By conformal field theory techniques we construct the genus-one, four-point string amplitude in AdS5×S5 in the low-energy expansion, dual to an N=4 super-Yang-Mills correlator in the 't Hooft limit at order 1/c2 in a strong coupling expansion. In the flat space limit, this maps onto the genus-one, four-point scattering amplitude for type II closed strings in ten dimensions. Using this approach we reproduce several results obtained via string perturbation theory. We also demonstrate a novel mechanism to fix subleading terms in the flat space limit of AdS amplitudes by using string/M-theory.

  • 202.
    Alexandrov, Sergei
    et al.
    Univ Montpellier, UMR CNRS 5221, L2C, F-34095 Montpellier, France.;CERN, Theoret Phys Dept, Geneva, Switzerland..
    Banerjee, Sibasish
    CEA, IPhT, F-91191 Gif Sur Yvette, France.;Max Planck Inst Math, Vivatsgasse 7, D-53111 Bonn, Germany..
    Longhi, Pietro
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Rigid limit for hypermultiplets and five-dimensional gauge theories2018Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, artikkel-id 156Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study the rigid limit of a class of hypermultiplet moduli spaces appearing in Calabi-Yau compactifications of type IIB string theory, which is induced by a local limit of the Calabi-Yau. We show that the resulting hyperkahler manifold is obtained by performing a hyperkahler quotient of the Swann bundle over the moduli space, along the isometries arising in the limit. Physically, this manifold appears as the target space of the non-linear sigma model obtained by compactification of a five-dimensional gauge theory on a torus. This allows to compute dyonic and stringy instantons of the gauge theory from the known results on D-instantons in string theory. Besides, we formulate a simple condition on the existence of a non-trivial local limit in terms of intersection numbers of the Calabi-Yau, and find an explicit form for the hypermultiplet metric including corrections from all mutually non-local D-instantons, which can be of independent interest.

  • 203. Anastasi, A.
    et al.
    Babusci, D.
    Bencivenni, G.
    Berlowski, M.
    Bloise, C.
    Bossi, F.
    Branchini, P.
    Budano, A.
    Caldeira Balkeståh, Li
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Cao, Bo
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Ceradini, F.
    Ciambrone, P.
    Curciarello, F.
    Czerwinski, E.
    D’Agostini, G.
    Danè, E.
    De Leo, V.
    De Lucia, E.
    De Santis, A.
    De Simone, P.
    Di Cicco, A.
    Di Domenico, A.
    Di Salvo, R.
    Domenici, D.
    D’Uffizi, A.
    Fantini, A.
    Felici, G.
    Fiore, S.
    Gajos, A.
    Gauzzi, P.
    Giardina, G.
    Giovannella, S.
    Graziani, E.
    Happacher, F.
    Heijkenskjöld, Lena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Ikegami Andersson, Walter
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Johansson, Tord
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Kaminska, D.
    Krzemien, W.
    Kupsc, Andrzej
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Loffredo, S.
    Mandaglio, G.
    Martini, M.
    Mascolo, M.
    Messi, R.
    Miscetti, S.
    Morello, G.
    Moricciani, D.
    Moskal, P.
    Papenbrock, Michael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Passeri, A.
    Patera, V.
    Perez del Rio, E.
    Ranieri, A.
    Santangelo, P.
    Sarra, I.
    Schioppa, M.
    Silarski, M.
    Sirghi, F.
    Tortora, L.
    Venanzoni, G.
    Wislicki, W.
    Wolke, Magnus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Precision measurement of the η → π + π − π 0 Dalitz plot distribution with the KLOE detector2016Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 5, artikkel-id 019Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Using 1.6 fb−1 of e + e − → ϕ → ηγ data collected with the KLOE detector at DAΦNE, the Dalitz plot distribution for the η → π + π − π 0 decay is studied with the world’s largest sample of ∼ 4.7 · 106 events. The Dalitz plot density is parametrized as a polynomial expansion up to cubic terms in the normalized dimensionless variables X and Y . The experiment is sensitive to all charge conjugation conserving terms of the expansion, including a gX 2 Y term. The statistical uncertainty of all parameters is improved by a factor two with respect to earlier measurements.

  • 204.
    Anastasi, A.
    et al.
    INFN, Lab Nazl Frascati, Frascati, Italy.;Univ Messina, Dipartimento Sci Matemat & Informat Sci Fis & Sci, Messina, Italy..
    Babusci, D.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Berlowski, M.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Bloise, C.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Bossi, F.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Branchini, P.
    INFN, Sez Roma Tre, Rome, Italy..
    Budano, A.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.;INFN, Sez Roma Tre, Rome, Italy..
    Balkeståhl, Li Caldeira
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Cao, Bo
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Ceradini, F.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.;INFN, Sez Roma Tre, Rome, Italy..
    Ciambrone, P.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Curciarello, F.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Czerwinski, E.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    D'Agostini, G.
    Univ Sapienza, Dipartimento Fis, Rome, Italy.;INFN, Sez Roma, Rome, Italy..
    Dane, E.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    De Leo, V.
    INFN, Sez Roma Tor Vergata, Rome, Italy..
    De Lucia, E.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    De Santis, A.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    De Simone, P.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Di Cicco, A.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.;INFN, Sez Roma Tre, Rome, Italy..
    Di Domenico, A.
    Univ Sapienza, Dipartimento Fis, Rome, Italy.;INFN, Sez Roma, Rome, Italy..
    Domenici, D.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    D'Uffizi, A.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Fantini, A.
    Univ Tor Vergata, Dipartimento Fis, Rome, Italy.;INFN, Sez Roma Tor Vergata, Rome, Italy..
    Fantini, G.
    Gran Sasso Sci Inst, Laquila, Italy..
    Fermani, P.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Fiore, S.
    INFN, Sez Roma, Rome, Italy.;ENEA, Dept Fusion & Technol Nucl Safety & Secur, Frascati, RM, Italy..
    Gajos, A.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Gauzzi, P.
    Univ Sapienza, Dipartimento Fis, Rome, Italy.;INFN, Sez Roma, Rome, Italy..
    Giovannella, S.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Graziani, E.
    INFN, Sez Roma Tre, Rome, Italy..
    Ivanov, V. L.
    Budker Inst Nucl Phys, Novosibirsk, Russia.;Novosibirsk State Univ, Novosibirsk, Russia..
    Johansson, Tord
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Kang, X.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Kisielewska-Kaminska, D.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Kozyrev, E. A.
    Budker Inst Nucl Phys, Novosibirsk, Russia.;Novosibirsk State Univ, Novosibirsk, Russia..
    Krzemien, W.
    Natl Ctr Nucl Res, Warsaw, Poland..
    Kupsc, Andrzej
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Loffredo, S.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.;INFN, Sez Roma Tre, Rome, Italy..
    Lukin, P. A.
    Budker Inst Nucl Phys, Novosibirsk, Russia.;Novosibirsk State Univ, Novosibirsk, Russia..
    Mandaglio, G.
    INFN, Sez Catania, Catania, Italy.;Univ Messina, Dipartimento Sci Chim Biol Farmaceut & Ambientali, Messina, Italy..
    Martini, M.
    INFN, Lab Nazl Frascati, Frascati, Italy.;Univ Guglielmo Marconi, Dipartimento Sci &Tecnol Applicate, Rome, Italy..
    Messi, R.
    Univ Tor Vergata, Dipartimento Fis, Rome, Italy.;INFN, Sez Roma Tor Vergata, Rome, Italy..
    Miscetti, S.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Morello, G.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Moricciani, D.
    INFN, Sez Roma Tor Vergata, Rome, Italy..
    Moskal, P.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Passeri, A.
    INFN, Sez Roma Tre, Rome, Italy..
    Patera, V.
    Univ Sapienza, Dipartimento Sci Base & Applicate Ingn, Rome, Italy.;INFN, Sez Roma, Rome, Italy..
    del Rio, E. Perez
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Raha, N.
    INFN, Sez Roma Tor Vergata, Rome, Italy..
    Santangelo, P.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Schioppa, M.
    Univ Calabria, Dipartimento Fis, Arcavacata Di Rende, Italy.;INFN, Grp Collegato Cosenza, Arcavacata Di Rende, Italy..
    Selce, A.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.;INFN, Sez Roma Tre, Rome, Italy..
    Silarski, M.
    Jagiellonian Univ, Inst Phys, Krakow, Poland..
    Sirghi, F.
    INFN, Lab Nazl Frascati, Frascati, Italy..
    Solodov, E. P.
    Budker Inst Nucl Phys, Novosibirsk, Russia.;Novosibirsk State Univ, Novosibirsk, Russia..
    Tortora, L.
    INFN, Sez Roma Tre, Rome, Italy..
    Venanzoni, G.
    INFN, Sez Pisa, Pisa, Italy..
    Wislicki, W.
    Natl Ctr Nucl Res, Warsaw, Poland..
    Wolke, Magnus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Keshavarzi, A.
    Univ Liverpool, Dept Math Sci, Liverpool L69 3BX, Merseyside, England..
    Mueller, S. E.
    Helmholtz Zentrum Dresden Rossendorf, Dept Informat Serv & Comp, Dresden, Germany.;Helmholtz Zentrum Dresden Rossendorf, Inst Radiat Phys, Dresden, Germany..
    Teubner, T.
    Univ Liverpool, Dept Math Sci, Liverpool L69 3BX, Merseyside, England..
    Combination of KLOE sigma (e(+) e(-) -> pi(+)pi(-) gamma(gamma)) measurements and determination of a(mu)(pi+pi-) in the energy range 0.10 < s < 0.95 GeV22018Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 3, artikkel-id 173Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The three precision measurements of the cross section sigma (e(+)e(-) -> pi(+)pi(-)gamma(gamma)) using initial state radiation by the KLOE collaboration provide an important input for the prediction of the hadronic contribution to the anomalous magnetic moment of the muon. These measurements are correlated for both statistical and systematic uncertainties and, therefore, the simultaneous use of these measurements requires covariance matrices that fully describe the correlations. We present the construction of these covariance matrices and use them to determine a combined KLOE measurement for sigma (e(+)e(-) -> pi(+)pi(-)gamma(gamma)). We find, from this combination, a two-pion contribution to the muon magnetic anomaly in the energy range 0.10 < s < 0.95 GeV2 of a(mu)(pi+pi-) (489.8 +/- 1.7(stat) +/- 4.8(sys)) x 10(-10).

  • 205.
    Anastasi, A.
    et al.
    Univ Messina, Dipartimento Sci Matemat & Informat, Sci Fis & Sci Terra, Messina, Italy;Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Babusci, D.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Berlowski, M.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy;Natl Ctr Nucl Res, Warsaw, Poland.
    Bloise, C.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Bossi, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Branchini, P.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy.
    Budano, A.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy;Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Cao, Bo
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Capon, G.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Ceradini, F.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy;Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Ciambrone, P.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Curciarello, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Czerwinski, E.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    D'Agostini, G.
    Univ Sapienza, Dipartimento Fis, Rome, Italy;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy.
    Dane, E.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    De Leo, V.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy.
    De Lucia, E.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    De Santis, A.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    De Simone, P.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Di Cicco, A.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy;Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Di Domenico, A.
    Univ Sapienza, Dipartimento Fis, Rome, Italy;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy.
    Domenici, D.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    D'Uffizi, A.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Fantini, A.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy;Univ Tor Vergata, Dipartimento Fis, Rome, Italy.
    Fantini, G.
    Gran Sasso Sci Inst, Laquila, Italy.
    Fermani, P.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Fiore, S.
    Ist Nazl Fis Nucl, Sez Roma, Rome, Italy;Casaccia RC, ENEA UTTMAT IRR, Rome, Italy.
    Gajos, A.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Gauzzi, P.
    Univ Sapienza, Dipartimento Fis, Rome, Italy;Ist Nazl Fis Nucl, Sez Roma, Rome, Italy.
    Giovannella, S.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Graziani, E.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy.
    Ivanov, V. L.
    Budker Inst Nucl Phys, Novosibirsk, Russia;Novosibirsk State Univ, Novosibirsk, Russia.
    Johansson, Tord
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Kang, X.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Kisielewska-Kaminska, D.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Kozyrev, E. A.
    Novosibirsk State Univ, Novosibirsk, Russia.
    Krzemien, W.
    Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Kupsc, Andrzej
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Loffredo, S.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy;Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Lukin, P. A.
    Novosibirsk State Univ, Novosibirsk, Russia.
    Mandaglio, G.
    Univ Messina, Dipartimento Sci Chim Biol Farmaceut & Ambientali, Messina, Italy;Ist Nazl Fis Nucl, Sez Catania, Catania, Italy.
    Martini, M.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy;Univ Guglielmo Marconi, Dipartimento Sci & Tecnol Applicate, Rome, Italy.
    Messi, R.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy;Univ Tor Vergata, Dipartimento Fis, Rome, Italy.
    Miscetti, S.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Moricciani, D.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy.
    Moskal, P.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Passeri, A.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy.
    Patera, V.
    Ist Nazl Fis Nucl, Sez Roma, Rome, Italy;Univ Sapienza, Dipartimento Sci Base & Applicate Ingn, Rome, Italy.
    del Rio, E. Perez
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Raha, N.
    Ist Nazl Fis Nucl, Sez Roma Tor Vergata, Rome, Italy.
    Santangelo, P.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy.
    Schioppa, M.
    Univ Calabria, Dipartimento Fis, Arcavacata Di Rende, Italy;Ist Nazl Fis Nucl, Grp Collegato Cosenza, Arcavacata Di Rende, Italy.
    Selce, A.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy;Univ Roma Tre, Dipartimento Matemat & Fis, Rome, Italy.
    Silarski, M.
    Jagiellonian Univ, Inst Phys, Krakow, Poland.
    Sirghi, F.
    Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy;Horia Hulubei Natl Inst Phys & Nucl Engn, Magurele, Romania.
    Solodov, E. P.
    Budker Inst Nucl Phys, Novosibirsk, Russia;Novosibirsk State Univ, Novosibirsk, Russia.
    Tortora, L.
    Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy.
    Venanzoni, G.
    Ist Nazl Fis Nucl, Sez Pisa, Pisa, Italy.
    Wislicki, W.
    Natl Ctr Nucl Res, Warsaw, Poland.
    Wolke, Magnus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Measurement of the charge asymmetry for the K-S -> pi e nu decay and test of CPT symmetry with the KLOE detector2018Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 9, artikkel-id 021Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Using 1.63 fb(-1) of integrated luminosity collected by the KLOE experiment about 7 x 10(4) K-S -> pi(+/-)e(-/+)nu decays have been reconstructed. The measured value of the charge asymmetry for this decay is A(S) = (-4.9 +/- 5.7(stat) +/- 2.6(syst)) x 10(-3) which is almost twice more precise than the previous KLOE result. The combination of these two measurements gives A(S) = (3.8 +/- 5.0(stat) +/- 2.6(syst)) x 10(-3) and, together with the asymmetry of the K-L semileptonic decay, provides significant tests of the CPT symmetry. The obtained results are in agreement with CPT invariance.

  • 206. Anderson, Louise
    et al.
    Zarembo, Konstantin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Quantum phase transitions in mass-deformed ABJM matrix model2014Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 9, s. 021-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    When mass-deformed ABJM theory is considered on S-3, the partition function of the theory localises, and is given by a matrix model. At large N, we solve this model in the decompactification limit, where the radius of the three-sphere is taken to infinity. In this limit, the theory exhibits a rich phase structure with an infinite number of third-order quantum phase transitions, accumulating at strong coupling.

  • 207.
    Apruzzi, Fabio
    et al.
    Univ N Carolina, Dept Phys, Chapel Hill, NC 27599 USA; CUNY, Grad Ctr, Initiat Theoret Sci, New York, NY 10016 USA; olumbia Univ, Dept Phys, 538 W 120th St, New York, NY 10027 USA.
    Dibitetto, Giuseppe
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Tizzano, Luigi
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    A new 6d fixed point from holography2016Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 11, artikkel-id 126Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We propose a stringy construction giving rise to a class of interacting and non-supersymmetric CFT's in six dimensions. Such theories may be obtained as an IR conformal fixed point of an RG flow ending up in a (1,0)" role="presentation" style="display: inline; font-size: 13.6px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; font-family: arial, verdana, sans-serif; position: relative;">(1,0)(1,0) theory in the UV. We provide the due holographic evidence in the context of massive type IIA on AdS7&#x00D7;M3" role="presentation" style="display: inline; font-size: 13.6px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; font-family: arial, verdana, sans-serif; position: relative;">AdS7×M3AdS7×M3, where M3" role="presentation" style="display: inline; font-size: 13.6px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; font-family: arial, verdana, sans-serif; position: relative;">M3M3 is topologically an S3" role="presentation" style="display: inline; font-size: 13.6px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; font-family: arial, verdana, sans-serif; position: relative;">S3S3. In particular, in this paper we present a 10d flow solution which may be interpreted as a non-BPS bound state of NS5, D6 and D6&#x00AF;" role="presentation" style="display: inline; font-size: 13.6px; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; font-family: arial, verdana, sans-serif; position: relative;">D6⎯⎯⎯⎯⎯⎯⎯D6¯ branes. Moreover, by adopting its 7d effective desciption, we are able to holographically compute the free energy and the operator spectrum in the novel IR conformal fixed point.

  • 208.
    Apruzzi, Fabio
    et al.
    Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA;Univ N Carolina, Dept Phys, Chapel Hill, NC 27599 USA.
    Heckman, Jonathan J.
    Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA.
    Morrison, David R.
    Univ Calif Santa Barbara, Dept Math, Santa Barbara, CA 93106 USA;Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA.
    Tizzano, Luigi
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    4D gauge theories with conformal matter2018Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 9, artikkel-id 088Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    One of the hallmarks of 6D superconformal field theories (SCFTs) is that on a partial tensor branch, all known theories resemble quiver gauge theories with links comprised of 6D conformal matter, a generalization of weakly coupled hypermultiplets. In this paper we construct 4D quiverlike gauge theories in which the links are obtained from compactifications of 6D conformal matter on Riemann surfaces with flavor symmetry fluxes. This includes generalizations of super QCD with exceptional gauge groups and quarks replaced by 4D conformal matter. Just as in super QCD, we find evidence for a conformal window as well as confining gauge group factors depending on the total amount of matter. We also present F-theory realizations of these field theories via elliptically fibered Calabi-Yau fourfolds. Gauge groups (and flavor symmetries) come from 7-branes wrapped on surfaces, conformal matter localizes at the intersection of pairs of 7-branes, and Yukawas between 4D conformal matter localize at points coming from triple intersections of 7-branes. Quantum corrections can also modify the classical moduli space of the F-theory model, matching expectations from effective field theory.

  • 209.
    Arabi Ardehali, Arash
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik. Inst Res Fundamental Sci IPM, Sch Phys, POB 19395-5531, Tehran, Iran.
    Cardy-like asymptotics of the 4d N=4 index and AdS(5) blackholes2019Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 6, artikkel-id 134Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Choi, Kim, Kim, and Nahmgoong have recently pioneered analyzing a Cardy-like limit of the superconformal index of the 4d N=4 theory with complexified fugacities which encodes the entropy of the dual supersymmetric AdS(5) blackholes. Here we study the Cardy-like asymptotics of the index within the rigorous framework of elliptic hypergeometric integrals, thereby filling a gap in their derivation of the blackhole entropy function, finding a new blackhole saddle-point, and demonstrating novel bifurcation phenomena in the asymptotics of the index as a function of fugacity phases. We also comment on the relevance of the supersymmetric Casimir energy to the blackhole entropy function in the present context.

  • 210.
    Arabi Ardehali, Arash
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Larsen, Finn
    Leinweber Center for Theoretical Physics, Randall Laboratory of Physics,The University of Michigan, Ann Arbor, MI 48109–1040, USA.
    Liu, James T.
    Leinweber Center for Theoretical Physics, Randall Laboratory of Physics,The University of Michigan, Ann Arbor, MI 48109–1040, USA.
    Szepietowski, Phillip
    Institute for Theoretical Physics, University of Amsterdam,Science Park 904, 1098 XH Amsterdam, The Netherlands; nstitute for Theoretical Physics and Center for Extreme Matter and Emergent Phenomena,Utrecht University, Princetonplein 5, 3584 CC Utrecht, the Netherlands.
    Quantum Corrections to Central Charges and Supersymmetric Casimir Energy in AdS3/CFT22019Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 7, artikkel-id 71Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study the Casimir energy of bulk fields in AdS3 and its relation to subleading terms in the central charge of the dual CFT2. Computing both sides of the standard CFT2 relation E=−c/12 independently we show that this relation is not necessarily satisfied at the level of individual bulk supergravity states, but in theories with sufficient supersymmetry it is restored at the level of bulk supermultiplets. Assuming only (0,2) supersymmetry (or more), we improve the situation by relating quantum corrections to the central charge and the supersymmetric Casimir energy which in turn is related to an index. These relations adapt recent progress on the AdS5/CFT4 correspondence to AdS3/CFT2 holography. We test our formula successfully in several examples, including the (0,4) MSW theory describing classes of 4D black holes and the large (4,4) theory that is interesting for higher spin holography. We also make predictions for the subleading central charges in several recently proposed (2,2) dualities where the CFT2 is not yet well-understood.

  • 211. Arai, Masato
    et al.
    Kuzenko, Sergei M.
    Lindström, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik.
    Hyperkahler sigma models on cotangent bundles of Hermitian symmetric spaces using projective superspace2007Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 2, s. 100-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Kahler manifolds have a natural hyperkahler structure associated with (part of) their cotangent bundles. Using projective superspace, we construct four-dimensional N=2 models on the tangent bundles of some classical Hermitian symmetric spaces (specifically, the four regular series of irreducible compact symmetric Kahler manifolds, and their non-compact versions). A further dualization yields the Kahler potential for the hyperkahler metric on the cotangent bundle.

  • 212. Arai, Masato
    et al.
    Kuzenko, Sergei M.
    Lindström, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik.
    Polar supermultiplets, Hermitian symmetric spaces and hyperkahler metrics2007Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 12, s. 008-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We address the construction of four-dimensional N = 2 supersymmetric non-linear sigma models on tangent bundles of arbitrary Hermitian symmetric spaces startingfrom projective superspace. Using a systematic way of solving the (infinite number of) aux-iliary field equations along with the requirement of supersymmetry, we are able to derivea closed form for the Lagrangian on the tangent bundle and to dualize it to give the hy-perk ̈hler potential on the cotangent bundle. As an application, the case of the exceptional     asymmetric space E6 / SO(10) × U(1) is explicitly worked out for the first time.

  • 213.
    Azevedo, Thales
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Engelund, Oluf Tang
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Ambitwistor formulations of R2 gravity and (DF)2 gauge theories2017Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 11, artikkel-id 052Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We consider D-dimensional amplitudes in R-2 gravities (conformal gravity in D = 4) and in the recently introduced (DF)(2) gauge theory, from the perspective of the CHY formulae and ambitwistor string theory. These theories are related through the BCJ double-copy construction, and the (DF)(2) gauge theory obeys color-kinematics duality. We work out the worldsheet details of these theories and show that they admit a formulation as integrals on the support of the scattering equations, or alternatively, as ambitwistor string theories. For gravity, this generalizes the work done by Berkovits and Witten on conformal gravity to D dimensions. The ambitwistor is also interpreted as a D-dimensional generalization of Witten's twistor string (SYM + conformal supergravity). As part of our ambitwistor investigation, we discover another (DF)(2) gauge theory containing a photon that couples to Einstein gravity. This theory can provide an alternative KLT description of Einstein gravity compared to the usual Yang-Mills squared.

  • 214.
    Azevedo, Thales
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Jusinskas, Renann Lipinski
    AS CR, Inst Phys, Na Slovance 2, Prague 18221, Czech Republic..
    Background constraints in the infinite tension limit of the heterotic string2016Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 8, artikkel-id 133Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this work we investigate the classical constraints imposed on the supergravity and super Yang-Mills backgrounds in the alpha' -> 0 limit of the heterotic string using the pure spinor formalism. Guided by the recently observed sectorization of the model, we show that all the ten-dimensional constraints are elegantly obtained from the single condition of nilpotency of the BRST charge.

  • 215.
    Azevedo, Thales
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Jusinskas, Renann Lipinski
    Inst Phys AS CR, Slovance 2, Prague 18221, Czech Republic.
    Connecting the ambitwistor and the sectorized heterotic strings2017Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 10, artikkel-id 216Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The sectorized description of the (chiral) heterotic string using pure spinors has been misleadingly viewed as an in finite tension string. One evidence for this fact comes from the tree level 3-point graviton amplitude, which we show to contain the usual Einstein term plus a higher curvature contribution. After reintroducing a dimensionful parameter l in the theory, we demonstrate that the heterotic model is in fact two-fold, depending on the choice of the supersymmetric sector, and that the spectrum also contains one massive (open string like) multiplet. By taking the limit l -> 1 infinity, we finally show that the ambitwistor string is recovered, reproducing the unexpected heterotic state in Mason and Skinner's RNS description.

  • 216.
    Azevedo, Tholes
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Chiodaroli, Marco
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Johansson, Henrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik. KTH Royal Inst Technol, Roslagstullsbacken 23, Stockholm, Sweden.
    Schlotterer, Oliver
    Albert Einstein Inst, Max Planck Inst Gravitationphys, D-14476 Potsdam, Germany;Perimeter Inst Theoret Phys, Waterloo, ON N2L 2Y5, Canada.
    Heterotic and bosonic string amplitudes via field theory2018Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 10, artikkel-id 012Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Previous work has shown that massless tree amplitudes of the type I and IIA/B superstrings can be dramatically simplified by expressing them as double copies between field-theory amplitudes and scalar disk/sphere integrals, the latter containing all the alpha'-corrections. In this work, we pinpoint similar double-copy constructions for the heterotic and bosonic string theories using an alpha'-dependent field theory and the same disk/sphere integrals. Surprisingly, this field theory, built out of dimension-six operators such as (D mu F mu v)(2), has previously appeared in the double-copy construction of conformal supergravity. We elaborate on the alpha' -> infinity limit in this picture and derive new amplitude relations for various gauge-gravity theories from those of the heterotic string.

  • 217. Babichenko, A.
    et al.
    Dekel, Amit
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Sax, O. O.
    Finite-gap equations for strings on AdS 3 times S 3 times T 4 with mixed 3-form flux2014Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 11, s. 122-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study superstrings on AdS 3 times S 3 times T 4 supported by a combination of Ramond-Ramond and Neveu-Schwarz-Neveu-Schwarz three form fluxes, and write down a set of finite-gap equations that describe the massive part of the classical string spectrum. Using the recently proposed all-loop S-matrix we write down the all-loop Bethe ansatz equations for the massive sector. In the thermodynamic limit the Bethe ansatz reproduces the finite-gap equations. As part of this derivation we propose expressions for the leading order dressing phases. These phases differ from the well-known Arutyunov-Frolov-Staudacher phase that appears in the pure Ramond-Ramond case. We also consider the one-loop quantisation of the algebraic curve and determine the one-loop corrections to the dressing phases. Finally we consider some classical string solutions including finite size giant magnons and circular strings.

  • 218. Babichenko, A.
    et al.
    Stefanski, B., Jr.
    Zarembo, Konstantin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Integrability and the AdS(3)/CFT2 correspondence2010Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 3, s. 058-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We investigate the AdS(3)/CFT2 correspondence for theories with 16 supercharges using the integrability approach. We construct Green-Schwarz actions for Type IIB strings on AdS(3) x S-3 x M-4 where M-4 = T-4 or S-3 x S-1 using the coset approach. These actions are based on a Z(4) automorphism of the super-coset D(2, 1; alpha) x D(2, 1; alpha)/SO(1, 2) x SO(3) x SO(3). The equations of motion admit a representation in terms of a Lax connection, showing that the system is classically integrable. We present the finite gap equations for these actions. When alpha = 0, 1/2, 1 we propose a set of quantum Bethe equations valid at all values of the coupling. The AdS(3)/CFT2 duals contain novel massless modes whose role remains to be explored.

  • 219. Babusci, D.
    et al.
    Badoni, D.
    Balwierz-Pytko, I.
    Bencivenni, G.
    Bini, C.
    Bloise, C.
    Bossi, F.
    Branchini, P.
    Budano, A.
    Balkestahl, Li Caldeira
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Capon, G.
    Ceradini, F.
    Ciambrone, P.
    Czerwinski, E.
    Dane, E.
    De Lucia, E.
    De Robertis, G.
    De Santis, A.
    Di Domenico, A.
    Di Donato, C.
    Di Salvo, R.
    Domenici, D.
    Erriquez, O.
    Fanizzi, G.
    Fantini, A.
    Felici, G.
    Fiore, S.
    Franzini, P.
    Gauzzi, P.
    Giardina, G.
    Giovannella, S.
    Gonnella, F.
    Graziani, E.
    Happacher, F.
    Heijkenskjöld, Lena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Höistad, Bo
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Iafolla, L.
    Jacewicz, Marek
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik.
    Johansson, Tord
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Kupsc, Andrzej
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Lee-Franzini, J.
    Leverington, B.
    Loddo, F.
    Loffredo, S.
    Mandaglio, G.
    Martemianov, M.
    Martini, M.
    Mascolo, M.
    Messi, R.
    Miscetti, S.
    Morello, G.
    Moricciani, D.
    Moskal, P.
    Nguyen, F.
    Passeri, A.
    Patera, V.
    Longhi, I. Prado
    Ranieri, A.
    Redmer, C. F.
    Santangelo, P.
    Sarra, I.
    Schioppa, M.
    Sciascia, B.
    Silarski, M.
    Taccini, C.
    Tortora, L.
    Venanzoni, G.
    Wislicki, W.
    Wolke, Magnus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Zdebik, J.
    Measurement of eta meson production in gamma gamma interactions and Gamma(eta -> gamma gamma) with the KLOE detector2013Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 1, s. 119-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We present a measurement of eta meson production in photon-photon interactions produced by electron-positron beams colliding with root s = 1 GeV. The measurement is done with the KLOE detector at the phi-factory DA Phi NE with an integrated luminosity of 0.24 fb(-1). The e(+)e(-) -> e(+)e(-)eta cross section is measured without detecting the outgoing electron and positron, selecting the decays eta -> pi(+)pi(-)pi(0) and eta -> pi(0)pi(0)pi(0). The most relevant background is due to e(+)e(-) -> eta gamma when the monochromatic photon escapes detection. The cross section for this process is measured as sigma(e(+)e(-) -> eta gamma) = (856 +/- 8(stat) +/- 16(syst)) pb. The combined result for the e(+)e(-) -> e(+)e(-)eta cross section is sigma(e(+)e(-) -> e(+)e(-)eta) = (32.72 +/- 1.27(stat) +/- 0.70(syst)) pb. From this we derive the partial width Gamma(eta -> gamma gamma) = (520 +/- 20(stat) +/- 13(syst)) eV. This is in agreement with the world average and is the most precise measurement to date.

  • 220.
    Bah, Ibrahima
    et al.
    Univ Calif San Diego, La Jolla, USA; Johns Hopkins Univ, Baltimore, USA.
    Passias, Achilleas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Tomasiello, Alessandro
    Univ Milano Bicocca, Milan, Italy; INFN, Milan, Italy.
    AdS(5) compactifications with punctures in massive IIA supergravity2017Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 11, artikkel-id 050Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We find AdS(5) solutions holographically dual to compactifications of six-dimensional N=(1,0) supersymmetric field theories on Riemann surfaces with punctures. We simplify a previous analysis of supersymmetric AdS(5) IIA solutions, and with a suitable Ansatz we find explicit solutions organized in three classes, where an O8-D8 stack, D6- and D4-branes are simultaneously present, localized and partially localized. The D4-branes are smeared over the Riemann surface and this is interpreted as the presence of a uniform distribution of punctures. For the first class we identify the corresponding six-dimensional theory as an E-string theory coupled to a quiver gauge theory. The second class of solutions lacks D6-branes and its central charge scales as n(5/2), suggesting a five-dimensional origin for the dual field theory. The last class has elements of the previous two.

  • 221.
    Bah, Ibrahima
    et al.
    Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD USA.
    Passias, Achilleas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Weck, Peter
    Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD USA.
    Holographic duals of five-dimensional SCFTs on a Riemann surface2018Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 1, artikkel-id 058Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study the twisted compacti fi cations of fi ve-dimensional Seiberg SCFTs, with SU M (2) ENf+1 avor symmetry, on a generic Riemann surface that preserves four supercharges. The fi ve-dimensional SCFTs are obtained from the decoupling limit of N D4-branes probing a geometry of Nf < 8 D8-branes and an O8-plane. In addition to the R-symmetry, we can also twist the avor symmetry by turning on background ux on the Riemann surface. In particular, in the string theory construction of the fi ve-dimensional SCFTs, the background ux for the SU M (2) has a geometric origin, similar to the topological twist of the R-symmetry. We argue that the resulting low-energy three-dimensional theories describe the dynamics on the world-volume of the N D4-branes wrapped on the Riemann surface in the O8/D8 background. The Riemann surface can be described as a curve in a Calabi-Yau three-fold that is a sum of two line bundles over it. This allows for an explicit construction of AdS 4 solutions in massive IIA supergravity dual to the worldvolume theories, thereby providing strong evidence that the three-dimensional SCFTs exist in the low-energy limit of the compacti fi cation of the fi ve-dimensional SCFTs. We compute observables such as the free energy and the scaling dimensions of operators dual to D2-brane probes; these have non-trivial dependence on the twist parameter for the U(1) in SU M (2). The free energy exhibits the N5=2 scaling that is emblematic of fi ve-dimensional SCFTs.

  • 222.
    Bak, Dongsu
    et al.
    Univ Seoul, Phys Dept, Seoul 02504, South Korea..
    Gustafsson, Andreas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Five-dimensional fermionic Chern-Simons theory2018Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, artikkel-id 037Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study 5d fermionic CS theory with a fermionic 2-form gauge potential. This theory can be obtained from 5d maximally supersymmetric YM theory by performing the maximal topological twist. We put the theory on a five-manifold and compute the partition function. We find that it is a topological quantity, which involves the Ray-Singer torsion of the five-manifold. For abelian gauge group we consider the uplift to the 6d theory and find a mismatch between the 5d partition function and the 6d index, due to the nontrivial dimensional reduction of a selfdual two-form gauge field on a circle. We also discuss an application of the 5d theory to generalized knots made of 2d sheets embedded in 5d.

  • 223. Balasubramanian, V.
    et al.
    Bernamonti, A.
    Craps, B.
    Keränen, V.
    Keski-Vakkuri, Esko
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Müller, B.
    Thorlacius, L.
    Vanhoof, J.
    Thermalization of the spectral function in strongly coupled two dimensional conformal field theories2013Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 4, s. 069-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Using Wigner transforms of Green functions, we discuss non-equilibrium generalizations of spectral functions and occupation numbers. We develop methods for computing time-dependent spectral functions in conformal field theories holographically dual to thin-shell AdS-Vaidya spacetimes.

  • 224. Balasubramanian, V.
    et al.
    Bernamonti, A.
    de Boer, J.
    Craps, B.
    Franti, L.
    Galli, F.
    Keski-Vakkuri, Esko
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Mueller, B.
    Schaefer, A.
    Inhomogeneous holographic thermalization2013Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 10, s. 082-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The sudden injection of energy in a strongly coupled conformal field theory and its subsequent thermalization can be holographically modeled by a shell falling into anti-de Sitter space and forming a black brane. For a homogeneous shell, Bhattacharyya and Minwalla were able to study this process analytically using a weak field approximation. Motivated by event-by-event fluctuations in heavy ion collisions, we include inhomogeneities in this model, obtaining analytic results in a long wavelength expansion. In the early-time window in which our approximations can be trusted, the resulting evolution matches well with that of a simple free streaming model. Near the end of this time window, we find that the stress tensor approaches that of second-order viscous hydrodynamics. We comment on possible lessons for heavy ion phenomenology.

  • 225. Balatsky, Alexander
    et al.
    Gudnason, Sven Bjarke
    Kedem, Yaron
    Krikun, Alexander
    Thorlacius, Larus
    Zarembo, Konstantin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Classical and quantum temperature fluctuations via holography2015Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 1, artikkel-id 011Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study local temperature fluctuations in a 2+1 dimensional CFT on the sphere, dual to a black hole in asymptotically AdS spacetime. The fluctuation spectrum is governed by the lowest-lying hydrodynamic modes of the system whose frequency and damping rate determine whether temperature fluctuations are thermal or quantum. We calculate numerically the corresponding quasinormal frequencies and match the result with the hydrodynamics of the dual CFT at high temperature. As a by-product of our analysis we determine the appropriate boundary conditions for calculating low-lying quasinormal modes for a four-dimensional Reissner-Nordstrom black hole in global AdS.

  • 226.
    Banerjee, Souvik
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Bryan, Jan-Willem
    Univ Groningen, Van Swinderen Inst Particle Phys & Grav, Nijenborgh 4, NL-9747 AG Groningen, Netherlands..
    Vos, Gideon
    Univ Groningen, Van Swinderen Inst Particle Phys & Grav, Nijenborgh 4, NL-9747 AG Groningen, Netherlands..
    On the universality of late-time correlators in semi-classical 2d CFTs2018Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 8, artikkel-id 047Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the framework of the AdS3/CFT2 correspondence, we present a systematic analysis of the late time thermalization of a two dimensional CFT state created by insertion of small number of heavy operators on the vacuum. We show that at late Lorentzian time, the universal features of this thermalization are solely captured by the eigenvalues of the monodromy matrix corresponding to the solutions of the uniformization equation. We discuss two different ways to extract the monodromy eigenvalues while bypassing the need for finding explicitly the full monodromy matrix - first, using a monodromy preserving diffeomorphism and second using Chen-Simons formulation of gravity in AdS(3). Both of the methods yield the same precise relation between the eigenvalues and the final black hole temperature at late Lorentzian time.

  • 227.
    Banerjee, Souvik
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik. Julius Maximilians Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany..
    Erdmenger, Johanna
    Julius Maximilians Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany.;Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, Fohringer Ring 6, D-80805 Munich, Germany..
    Sarkar, Debajyoti
    Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, Fohringer Ring 6, D-80805 Munich, Germany.;Ludwig Maximilians Univ Munchen, Arnold Sommerfeld Ctr, Theresienstr 37, D-80333 Munich, Germany..
    Connecting Fisher information to bulk entanglement in holography2018Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 8, artikkel-id 001Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the context of relating AdS/CFT to quantum information theory, we propose a holographic dual of Fisher information metric for mixed states in the boundary field theory. This amounts to a holographic measure for the distance between two mixed quantum states. For a spherical subregion in the boundary we show that this is related to a particularly regularized volume enclosed by the Ryu-Takayanagi surface. We further argue that the quantum correction to the proposed Fisher information metric is related to the quantum correction to the boundary entanglement entropy. We discuss consequences of this connection.

  • 228. Bargheer, Till
    et al.
    Minahan, Joseph A.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Pereira, Raul
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Computing Three-Point Functions for Short Operators2014Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 3, s. 096-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We compute the three-point structure constants for short primary operators of N=4 super Yang-Mills theory to leading order in the inverse coupling by mapping the problem to a flat-space string theory calculation. We check the validity of our procedure by comparing to known results for three chiral primaries. We then compute the three-point functions for any combination of chiral and non-chiral primaries, with the non-chiral primaries all dual to string states at the first massive level. Along the way we find many cancellations that leave us with simple expressions, suggesting that integrability is playing an important role.

  • 229. Beisert, Niklas
    et al.
    Kazakov, V. A.
    Sakai, K.
    Zarembo, Konstantin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik, Teoretisk fysik.
    Complete spectrum of long operators in N=4 SYM at one loop2005Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 0507, s. 030-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We construct the complete spectral curve for an arbitrary local operator, including fermions and covariant derivatives, of one-loop N=4 gauge theory in the thermodynamic limit. This curve perfectly reproduces the Frolov-Tseytlin limit of the full spectral curve of classical strings on AdS_5xS^5 derived in hep-th/0502226. To complete the comparison we introduce stacks, novel bound states of roots of different flavors which arise in the thermodynamic limit of the corresponding Bethe ansatz equations. We furthermore show the equivalence of various types of Bethe equations for the underlying su(2,2|4) superalgebra, in particular of the type "Beauty" and "Beast".

  • 230. Benna, Marcus
    et al.
    Klebanov, Igor
    Klose, Thomas
    Smedback, Mikael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Superconformal Chern-Simons theories and AdS(4)/CFT3 correspondence2008Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 9, s. 072-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We discuss the N = 2 superspace formulation of the N = 8 superconformal Bagger-Lambert-Gustavsson theory, and of the N = 6 superconformal Aharony-Bergman-Jafferis-Maldacena U(N) x U(N) Chern-Simons theory. In particular, we prove the full SU(4)R-symmetry of the ABJM theory. We then consider orbifold projections of this theory that give non-chiral and chiral (U( N) x U(N))(n) superconformal quiver gauge theories. We argue that these theories are dual to certain AdS(4) x S-7/(Z(n) x Z (k$) over tilde) backgrounds of M-theory. We also study a SU(3) invariant mass term in the superpotential that makes the N = 8 theory flow to a N = 2 superconformal gauge theory with a sextic superpotential. We conjecture that this gauge theory is dual to the U(1)(R) x SU(3) invariant extremum of the N = 8 gauged supergravity, which was discovered by N. Warner 25 years ago and whose uplifting to 11 dimensions was found more recently.

  • 231.
    Ben-Shahar, Maor
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Chiodaroli, Marco
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    One-loop Amplitudes for N= 2 Homogeneous Supergravities2019Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 3, artikkel-id 153Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We compute one-loop matter amplitudes in homogeneous Maxwell-Einstein supergravities with N = 2 supersymmetry using the double-copy construction. We start from amplitudes of N = 2 super-Yang-Mills theory with matter that obey manifestly the duality between color and kinematics. Taking advantage of the fact that amplitudes with external hypermultiplets have kinematical numerators which do not present any explicit dependence on the loop momentum, we find a relation between the one-loop divergence of the supergravity amplitudes and the beta function of the non-supersymmetric gauge theory entering the construction. Two distinct linearized counterterms are generated at one loop. The divergence corresponding to the first is nonzero for all homogeneous supergravities, while the divergence associated to the second vanishes only in the case of the four Magical supergravities.

  • 232. Bhattacharya, Atri
    et al.
    Enberg, Rikard
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik.
    Jeong, Yu Seon
    Kim, C S
    Reno, Mary Hall
    Sarcevic, Ina
    Stasto, Anna
    Prompt atmospheric neutrino fluxes: perturbative QCD models and nuclear effects2016Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 11, artikkel-id 167Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We evaluate the prompt atmospheric neutrino flux at high energies using three different frameworks for calculating the heavy quark production cross section in QCD: NLO perturbative QCD, kT factorization including low-x resummation, and the dipole model including parton saturation. We use QCD parameters, the value for the charm quark mass and the range for the factorization and renormalization scales that provide the best description of the total charm cross section measured at fixed target experiments, at RHIC and at LHC. Using these parameters we calculate differential cross sections for charm and bottom production and compare with the latest data on forward charm meson production from LHCb at 7 TeV and at 13 TeV, finding good agreement with the data. In addition, we investigate the role of nuclear shadowing by including nuclear parton distribution functions (PDF) for the target air nucleus using two different nuclear PDF schemes. Depending on the scheme used, we find the reduction of the flux due to nuclear effects varies from 10% to 35% at the highest energies. Finally, we compare our results with the IceCube limit on the prompt neutrino flux, which is already providing valuable information about some of the QCD models.

  • 233.
    Bhattacharya, Atri
    et al.
    University of Arizona.
    Enberg, Rikard
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik.
    Reno, Mary Hall
    University of Iowa.
    Sarcevic, Ina
    University of Arizona.
    Stasto, Anna
    Pennsylvania State University and Institute of Nuclear Physics, Polish Academy of Sciences.
    Perturbative charm production and the prompt atmospheric neutrino flux in light of RHIC and LHC2015Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 6, artikkel-id 110Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We re-evaluate the prompt atmospheric neutrino flux, using the measured charm cross sections at RHIC and the Large Hadron Collider to constrain perturbative QCD parameters such as the factorization and renormalization scales, as well as modern parton distribution functions and recent estimates of the cosmic-ray spectra. We find that our result for the prompt neutrino flux is lower than previous perturbative QCD estimates and, consequently, alters the signal-to-background statistics of the recent IceCube measurements at high energies.

  • 234.
    Bissi, Agnese
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Hansen, Tobias
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Söderberg, Alexander
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Analytic Bootstrap for Boundary CFT2019Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, s. 1-20, artikkel-id 10Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We propose a method to analytically solve the bootstrap equation for two point functions in boundary CFT. We consider the analytic structure of the correlator in Lorentzian signature and in particular the discontinuity of bulk and boundary conformal blocks to extract CFT data. As an application, the correlator〈ϕϕ〉in ϕ4 theory at the Wilson-Fisher fixed point is computed to order ϵ2 in the ϵ expansion.

  • 235.
    Blaback, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Danielsson, Ulf H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Van Riet, Thomas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Lifshitz backgrounds from 10d supergravity2010Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 2, s. 095-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We investigate whether 4-dimensional static and cosmological Lifshitz solutions can be found from deforming the existing (A)dS(4) compactifications in IIA and IIA. supergravity. Using a well motivated compactification Ansatz on SU(3)-structure manifolds with 19 undetermined parameters we demonstrate that this is not the case in ordinary IIA supergravity, thereby generalising previous nogo results in different ways. On the other hand, for IIA* we construct explicit cosmological Lifshitz solutions. We also consider solutions with non-constant scalars and are able to find simple static and cosmological Lifshitz solutions in IIB* supergravity and a Euclidean Lifshitz solution in ordinary Euclidean IIB supergravity, which is similar to a non-extremal deformation of the D-instanton. The latter solutions have z = -2.

  • 236.
    Blabaeck, J.
    et al.
    Univ Paris Saclay, Inst Phys Theor, CEA, CNRS, F-91191 Gif Sur Yvette, France..
    Danielsson, Ulf H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Dibitetto, Giuseppe
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Vargas, Sergio. C.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Universal dS vacua in STU-models2015Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 10, artikkel-id 069Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Stable de Sitter solutions in minimal F-term supergravity are known to lie close to Minkowski critical points. We consider a class of STU-models arising from type IIB compactifications with generalised fluxes. There, we apply an analytical method for solving the equations of motion for the moduli fields based on the idea of treating derivatives of the superpotential of different orders up to third as independent objects. In particular, supersymmetric and no-scale Minkowski solutions are singled out by physical reasons. Focusing on the study of dS vacua close to supersymmetric Minkowski points, we are able to elaborate a complete analytical treatment of the mass matrix based on the sGoldstino bound. This leads to a class of interesting universal dS vacua. We finally explore a similar possibility around no-scale Minkowski points and discuss some examples.

  • 237.
    Blesneag, Stefan
    et al.
    Univ Oxford, Rudolf Peierls Ctr Theoret Phys, 1 Keble Rd, Oxford OX1 3NP, England.
    Buchbinder, Evgeny I.
    Univ Western Australia, Dept Phys M013, 35 Stirling Highway, Crawley, WA 6009, Australia.
    Constantin, Andrei
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Lukas, Andre
    Univ Oxford, Rudolf Peierls Ctr Theoret Phys, 1 Keble Rd, Oxford OX1 3NP, England.
    Palti, Eran
    Werner Heisenberg Inst, Max Planck Inst Phys, Fohringer Ring 6, D-80805 Munich, Germany.
    Matter field Kahler metric in heterotic string theory from localisation2018Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 4, artikkel-id 139Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We propose an analytic method to calculate the matter field Kahler metric in heterotic compactifications on smooth Calabi-Yau three-folds with Abelian internal gauge fields. The matter field Kahler metric determines the normalisations of the N = 1 chiral superfields, which enter the computation of the physical Yukawa couplings. We first derive the general formula for this Kahler metric by a dimensional reduction of the relevant supergravity theory and find that its T-moduli dependence can be determined in general. It turns out that, due to large internal gauge flux, the remaining integrals localise around certain points on the compactification manifold and can, hence, be calculated approximately without precise knowledge of the Ricci-flat Calabi-Yau metric. In a final step, we show how this local result can be expressed in terms of the global moduli of the Calabi-Yau manifold. The method is illustrated for the family of Calabi-Yau hypersurfaces embedded in P-1 x P-3 and we obtain an explicit result for the matter field Kahler metric in this case.

  • 238.
    Blåbäck, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Borghese, A.
    Haque, S. S.
    Power-law cosmologies in minimal and maximal gauged supergravity2013Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 6, s. 107-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper we search for accelerating power-law solutions and ekpyrotic solutions within minimal and maximal four dimensional supergravity theories. We focus on the STU model for N = 1 and on the new CSO(p, q, r) theories, which were recently obtained exploiting electromagnetic duality, for N = 8. In the minimal case we find some new ekpyrotic solutions, while in the maximal case we find some new generic power-law solutions. We do not find any new accelerating solutions for these models.

  • 239.
    Blåbäck, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Danielsson, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Dibitetto, Giuseppe
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Fully stable dS vacua from generalised fluxes2013Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 8, s. 054-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We investigate the possible existence of (meta-)stable de Sitter vacua within \cN=1 compactifications with generalised fluxes. With the aid of an algorithm inspired by the method of differential evolution, we were able to find three novel examples of completely tachyon-free de Sitter extrema in a non-isotropic type IIB model with non-geometric fluxes. We also analyse the surroundings of the aforementioned points in parameter space and chart the corresponding stability regions. These happen to occur at small values of the cosmological constant compared to the AdS scale.

  • 240.
    Blåbäck, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Danielsson, Ulf H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Junghans, D.
    Van Riet, T.
    Vargas, Sergio C.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Localised anti-branes in non-compact throats at zero and finite T2015Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 2, artikkel-id 018Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We investigate the 3-form singularities that are typical to anti-brane solutions in supergravity and check whether they can be cloaked by a finite temperature horizon. For anti-D3-branes in the Klebanov-Strassler background, this was already shown numerically to be impossible when the branes are partially smeared. In this paper, we present analytic arguments that also localised branes remain with singular 3-form fluxes at both zero and finite temperature. These results may have important, possibly fatal, consequences for constructions of meta-stable de Sitter vacua through uplifting.

  • 241.
    Blåbäck, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Danielsson, Ulf H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Junghans, Daniel
    Van Riet, Thomas
    Wrase, Timm
    Zagermann, Marco
    (Anti-)brane backreaction beyond perturbation theory2012Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2012, nr 2, s. 025-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We improve on the understanding of the backreaction of anti-D6-branes in a flux background that is mutually BPS with D6-branes. This setup is analogous to the study of the backreaction of anti-D3-branes inserted in the KS throat, but does not require us to smear the anti-branes or do a perturbative analysis around the BPS background. We solve the full equations of motion near the anti-D6-branes and show that only two boundary conditions are consistent with the equations of motion. Upon invoking a topological argument we eliminate the boundary condition with regular H flux since it cannot lead to a solution that approaches the right kind of flux away from the anti-D6-branes. This leaves us with a boundary condition which has singular, but integrable, H flux energy density.

  • 242.
    Blåbäck, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Danielsson, Ulf H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Junghans, Daniel
    Van Riet, Thomas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Wrase, Timm
    Zagermann, Marco
    Smeared versus localised sources in flux compactifications2010Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 12, s. 043-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We investigate whether vacuum solutions in flux compactifications that are obtained with smeared sources (orientifolds or D-branes) still survive when the sources are localised. This seems to rely on whether the solutions are BPS or not. First we consider two sets of BPS solutions that both relate to the GKP solution through T-dualities: (p + 1)-dimensional solutions from spacetime-filling Op-planes with a conformally Ricci-flat internal space, and p-dimensional solutions with Op-planes that wrap a 1-cycle inside an everywhere negatively curved twisted torus. The relation between the solution with smeared orientifolds and the localised version is worked out in detail. We then demonstrate that a class of non-BPS AdS(4) solutions that exist for IASD fluxes and with smeared D3-branes (or analogously for ISD fluxes with anti-D3-branes) does not survive the localisation of the (anti) D3-branes. This casts doubts on the stringy consistency of non-BPS solutions that are obtained in the limit of smeared sources.

  • 243.
    Blåbäck, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Danielsson, Ulf H.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Junghans, Daniel
    Van Riet, Thomas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Wrase, Timm
    Zagermann, Marco
    The problematic backreaction of SUSY-breaking branes2011Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 8, s. 105-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper we investigate the localisation of SUSY-breaking branes which, in the smeared approximation, support specific non-BPS vacua. We show, for a wide class of boundary conditions, that there is no flux vacuum when the branes are described by a genuine delta-function. Even more, we find that the smeared solution is the unique solution with a regular brane profile. Our setup consists of a non-BPS AdS(7) solution in massive IIA supergravity with smeared anti-D6-branes and fluxes T-dual to ISD fluxes in IIB supergravity.

  • 244.
    Blåbäck, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Danielsson, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Van Riet, Thomas
    Resolving anti-brane singularities through time-dependence2013Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 2, s. 61-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this note we discuss a possible resolution of the flux singularities associated with the insertion of branes in backgrounds supported by fluxes that carry charges opposite to the branes. We present qualitative arguments that such a setup could be unstable both in the closed and open string sector. The singularities in the fluxes then get naturally resolved by taking the true solution to be a time-dependent process in which flux gets attracted towards the brane and subsequently annihilates.In this note we discuss a possible resolution of the flux singularities associated with the insertion of branes in backgrounds supported by fluxes that carry charges opposite to the branes. We present qualitative arguments that such a setup could be unstable both in the closed and open string sector. The singularities in the fluxes then get naturally resolved by taking the true solution to be a time-dependent process in which flux gets attracted towards the brane and subsequently annihilates.

  • 245.
    Blåbäck, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Janssen, B.
    Van Riet, T.
    Vercnocke, B.
    Fractional branes, warped compactifications and backreacted orientifold planes2012Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2012, nr 10Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The standard extremal p-brane solutions in supergravity are known to allow for a generalisation which consists of adding a linear dependence on the worldvolume coordinates to the usual harmonic function. In this note we demonstrate that remarkably this generalisation goes through in exactly the same way for p-branes with fluxes added to it that correspond to fractional p-branes. We relate this to warped orientifold compactifications by trading the Dp-branes for Op-planes that solve the RR tadpole condition. This allows us to interpret the worldvolume dependence as due to lower-dimensional scalars that flow along the massless directions in the no-scale potential. Depending on the details of the fluxes these flows can be supersymmetric domain wall flows. Our solutions provide explicit examples of backreacted orientifold planes in compactifications with non-constant moduli.

  • 246.
    Blåbäck, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Janssen, Bert
    Van Riet, Thomas
    Vercnocke, Bert
    BPS domain walls from backreacted orientifolds2014Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 5, s. 040-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Compactifications with D-brane and orientifold sources lead to standard gauged supergravity theories if the sources are smeared over the internal directions. It is therefore of interest to find how the solutions described by the gauged supergravity are altered by properly localising the sources. In this paper we analyse this for BPS domain wall solutions in the seven-dimensional gauged supergravity obtained from an O6 toroidal orientifold in massive IIA supergravity. This is one of the simplest no-scale supergravities that can be constructed and analysed in full detail. We find the BPS domain walls when the O6 planes are smeared. When the O6 planes are localised the domain wall solutions live in a warped compactification and we present the first-order equations these domain walls obey in 10 dimensions. In order to get explicit expressions we also consider the non-compact versions of the solutions for which the O6 planes have been traded for D6 branes and we recover the gauged supergravity expressions for the domain walls in the leading terms of the warp factor. Through T-duality we obtain partially localised solutions for compactifications to four dimensions using O3 planes with 3-form fluxes.

  • 247.
    Bobev, Nikolay
    et al.
    Katholieke Univ Leuven, Inst Theoret Fys, Celestijnenlaan 200D, BE-3001 Leuven, Belgium..
    Dibitetto, Giuseppe
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Gautason, Fridrik Freyr
    Katholieke Univ Leuven, Inst Theoret Fys, Celestijnenlaan 200D, BE-3001 Leuven, Belgium.;Univ Paris Saclay, CNRS, Inst Phys Theor, CEA, F-91191 Gif Sur Yvette, France..
    Truijen, Brecht
    Katholieke Univ Leuven, Inst Theoret Fys, Celestijnenlaan 200D, BE-3001 Leuven, Belgium..
    Holography, brane intersections and six-dimensional SCFTs2017Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 2, artikkel-id 116Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study supersymmetric intersections of NS5-, D6- and D8-branes in type IIA string theory. We focus on the supergravity description of this system and identify a "near horizon" limit in which we recover the recently classified supersymmetric seven-dimensional AdS solutions of massive type IIA supergravity. Using a consistent truncation to seven-dimensional gauged supergravity we construct a universal supersymmetric deformation of these AdS vacua. In the holographic dual six-dimensional (1,0) superconformal field theory this deformation describes a universal RG flow on the tensor branch of the vacuum moduli space triggered by a vacuum expectation value for a protected scalar operator of dimension four.

  • 248. Bonechi, Francesco
    et al.
    Cabrera, Alejandro
    Zabzine, Maxim
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    AKSZ construction from reduction data2012Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 7, artikkel-id 068Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We discuss a general procedure to encode the reduction of the target space geometry into AKSZ sigma models. This is done by considering the AKSZ construction with target the BFV model for constrained graded symplectic manifolds. We investigate the relation between this sigma model and the one with the reduced structure. We also discuss several examples in dimension two and three when the symmetries come from Lie group actions and systematically recover models already proposed in the literature.

  • 249. Bonelli, Giulio
    et al.
    Tanzini, Aless
    Zabzine, Maxime
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för teoretisk fysik.
    Computing amplitudes in topological M-theory2007Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 3, s. 023-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We define a topological quantum membrane theory on a seven dimensionalmanifold of G2 holonomy. We describe in detail the path integral evaluation for membranegeometries given by circle bundles over Riemann surfaces. We show that when the targetspace is CY3 × S 1 quantum amplitudes of non-local observables of membranes wrappingthe circle reduce to the A-model amplitudes. In particular for genus zero we show thatour model computes the Gopakumar-Vafa invariants. Moreover, for membranes wrappingcalibrated homology spheres in the CY3 , we find that the amplitudes of our model arerelated to Joyce invariants.

  • 250. Borghese, A.
    et al.
    Dibitetto, Giuseppe
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Guarino, A.
    Roest, D.
    Varela, O.
    The SU(3)-invariant sector of new maximal supergravity2013Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, nr 3, s. 082-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We investigate the SU(3)-invariant sector of the one-parameter family of SO(8) gauged maximal supergravity that has been recently proposed. To this end, we construct the N=2 truncation of this theory and analyse its full vacuum structure. The number of critical point is doubled and includes new N=0 and N=1 branches. We numerically exhibit the parameter dependence of the location and cosmological constant of all extrema. Moreover, we provide their analytic expressions for cases of special interest. Connections with three-dimensional RG-flows are pointed out. Finally, while the mass spectra are found to be parameter independent in most cases, we show that the novel non-supersymmetric branch with SU(3) invariance provides the first counterexample to this.

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