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  • 1.
    Abbott, Michael C.
    et al.
    Brown University.
    Aniceto, Inês
    Brown University.
    Ohlsson Sax, Olof
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Dyonic Giant Magnons in CP3: Strings and Curves at Finite J2009In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 80, no 2, p. 026005-Article in journal (Refereed)
    Abstract [en]

    This paper studies giant magnons in AdS4×CP3 using both the string sigma model and the algebraic curve. We complete the dictionary of solutions by finding the dyonic generalization of the CP1string solution, which matches the “small” giant magnon in the algebraic curve, and by pointing out that the solution recently constructed by the dressing method is the “big” giant magnon. We then use the curve to compute finite-J corrections to all cases, which for the nondyonic cases always match the Arutyunov-Frolov-Zamaklar result. For the dyonic RP3 magnon we recover the S5answer, but for the small and big giant magnons we obtain new corrections.

  • 2.
    Astolfi, Davide
    et al.
    Dipartimento di Fisica, Università di Perugia, I.N.F.N. Sezione di Perugia, Italy.
    Giangreco Marotta Puletti, Valentina
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Grignani, Gianluca
    Dipartimento di Fisica, Università di Perugia, I.N.F.N. Sezione di Perugia, Italy.
    Harmark, Troels
    The Niels Bohr Institute, Copenhagen, Denmark.
    Orselli, Marta
    The Niels Bohr Institute, Copenhagen, Denmark.
    Finite-size corrections in the SU(2)×SU(2) sector of type IIA string theory on AdS4 x CP32009In: Nuclear Physics B, ISSN 0550-3213, E-ISSN 1873-1562, Vol. 810, no 1-2, p. 150-173Article in journal (Refereed)
    Abstract [en]

    We consider finite-size corrections in the SU(2)×SU(2) sector of type IIA string theory on , which is the string dual of the recently constructed  superconformal Chern–Simons theory of Aharony, Bergman, Jafferis and Maldacena (ABJM theory). The string states we consider are in the  subspace of  with an angular momentum J on  being large. We compute the finite-size corrections using two different methods, one is to consider curvature corrections to the Penrose limit giving an expansion in1/J, the other by considering a low energy expansion in λ=λ/J2 of the string theory sigma-model, λ being the 't Hooft coupling of the dual ABJM theory. For both methods there are interesting issues to deal with. In the near-pp-wave method there is a  interaction term for which we use zeta-function regularization in order to compute the 1/J correction to the energy. For the low energy sigma-model expansion we have to take into account a non-trivial coupling to a non-dynamical transverse direction. We find agreement between the two methods. At order λ and , for small λ, our results are analogous to the ones for the SU(2) sector in type IIB string theory on AdS5×S5. Instead at order  there are interactions between the two two-spheres. We compare our results with the recently proposed all-loop Bethe ansatz of Gromov and Vieira and find agreement.

  • 3. Benna, Marcus
    et al.
    Klebanov, Igor
    Klose, Thomas
    Smedback, Mikael
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Superconformal Chern-Simons theories and AdS(4)/CFT3 correspondence2008In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 9, p. 072-Article in journal (Refereed)
    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.

  • 4.
    Chialva, Diego
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Danielsson, Ulf H.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Johansson, Niklas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Theoretical Physics, Theoretical Physics.
    Larfors, Magdalena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Vonk, Marcel
    IHES.
    Deforming, revolving and resolving: New paths in the string theory landscape2008In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 02, article id 016Article in journal (Refereed)
    Abstract [en]

    In this paper we investigate the properties of series of vacua in the string theory landscape. In particular, we study minima to the flux potential in type IIB compactifications on the mirror quintic. Using geometric transitions, we embed its one-dimensional complex structure moduli space in that of another Calabi-Yau with h1,1 = 86 and h2,1 = 2. We then show how to construct infinite series of continuously connected minima to the mirror quintic potential by moving into this larger moduli space, applying its monodromies, and moving back. We provide an example of such series, and discuss their implications for the string theory landscape

  • 5.
    Freyhult, Lisa
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Kruczenski, Martin
    Purdue University.
    Tirziu, Alin
    Purdue University.
    Spiky strings in the SL(2) Bethe Ansatz at strong coupling from AdS/CFT2009In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 7, p. 038-Article in journal (Refereed)
    Abstract [en]

    We study spiky strings in the context of the SL(2) Bethe ansatz equations. We find an asymmetric distribution of Bethe roots along one cut that determines the all loop anomalous dimension at leading and subleading orders in a large S expansion. At leading order in strong coupling (large lambda) we obtain that the energy of such states is given, in terms of the spin S and the number of spikes n by E-S=n sqrt{lambda}/(2 pi) (ln 16 pi S/(n sqrt{lambda})+ ln sin (pi/n) - 1)+ O(ln S/S). This result matches perfectly the same expansion obtained from the known spiky string classical solution. We then discuss a two cut spiky string Bethe root distribution at one-loop in the SL(2) Bethe ansatz. In this case we find a limit where n goes to infinity, keeping (E+S)/n^2, (E-S)/n, J/n fixed. This is the one loop version of a limit previously considered in the context of the string classical solutions in AdS5 x S5. In that case it was related to a string solution in the AdS pp-wave background.

  • 6.
    Freyhult, Lisa
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Rej, Adam
    Staudacher, Matthias
    A generalized scaling function for AdS/CFT2008In: Journal of Statistical Mechanics: Theory and Experiment, ISSN 1742-5468, E-ISSN 1742-5468, p. P07015-Article in journal (Refereed)
    Abstract [en]

    We study a refined large spin limit for twist operators in the sl(2) sector of AdS/CFT. We derive a novel non-perturbative equation for the generalized two-parameter scaling function associated with this limit, and analyze it for weak coupling. It is expected to smoothly interpolate between weakly coupled gauge theory and string theory for strong coupling.

  • 7.
    Freyhult, Lisa
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Zieme, Stefan
    AEI, Potsdam.
    The virtual scaling function of AdS/CFT2009In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 79, no 10, p. 105009-Article in journal (Refereed)
    Abstract [en]

    We write an integral equation that incorporates finite corrections to the large spin asymptotics of N=4 SYM twist operators from the non-linear integral equation. We show that these corrections are an all-loop result, not affected by wrapping effects, and agree, after determining the strong coupling expansion, with string theory predictions.

  • 8.
    Giangreco Marotta Puletti, Valentina
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Aspects of quantum integrability for pure spinor superstring in AdS5 × S52008In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 09, p. 070-Article in journal (Refereed)
    Abstract [en]

    We consider the monodromy matrix for the pure spinor IIB superstring on AdS5 × S5 at leading order at strong coupling, in particular its variation under an infinitesimal and continuous deformation of the contour. Such variation is equivalent to the insertion of a local operator. Demanding the BRST-closure for such an operator rules out its existence, implying that the monodromy matrix remains contour-independent at the first order in perturbation theory. Furthermore we explicitly compute the field strength corresponding to the flat connections up to leading order and directly check that it is free from logarithmic divergences. The absence of anomaly in the coordinate transformation of the monodromy matrix and the UV-finiteness of the curvature tensor finally imply the integrability of the pure spinor superstring at the first order.

  • 9.
    Giangreco Marotta Puletti, Valentina
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    On string integrability: A journey through the two-dimensional hidden symmetries in the AdS/CFT dualities2009Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    One of the main topics in the modern String Theory are the conjectured string/gauge (AdS/CFT) dualities. Proving such conjectures is extremely difficult since the gauge and string theory perturbative regimes do not overlap. In this perspective, the discovery of infinitely many conserved charges, i.e. the integrability, in the planar AdS/CFT has allowed us to reach immense progresses in understanding and confirming the duality.The first part of this thesis is focused on the gravity side of the AdS5/CFT4 duality: we investigate the quantum integrability of the type IIB superstring on AdS5 x S5. In the pure spinor formulation we analyze the operator algebra by computing the operator product expansion of the Maurer-Cartan currents at the leading order in perturbation theory. With the same approach at one loop order, we show the path-independence of the monodromy matrix which implies the charge conservation law, strongly supporting the quantum integrability of the string sigma-model. We also verify that the Lax pair field strength remains well-defined at one-loop order being free from UV divergences. The same string sigma-model is analyzed in the Green-Schwarz formalism in the near-flat-space (NFS) limit. Such a limit remarkably simplifies the string world-sheet action but still leaving interesting physics. We use the NFS truncation to show the factorization of the world-sheet S-matrix at one-loop order. This property defines a two-dimensional field theory as integrable: it is the manifestation of the higher conserved charges. Hence, we have explicitly checked their presence at quantum level. The second part is dedicated to the AdS4/CFT3 duality: in particular the type IIA superstring on AdS4 x CP3. We compute the leading quantum corrections to the string energies for string configurations with a large but yet finite angular momentum on CP3 and show that they match the conjectured all-loop Bethe Ansatz equations.

    List of papers
    1. Operator product expansion for pure spinor superstring on AdS5 x S5
    Open this publication in new window or tab >>Operator product expansion for pure spinor superstring on AdS5 x S5
    2006 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 10, p. 057-Article in journal (Refereed) Published
    Abstract [en]

    The tree-level operator product expansion coefficients of the matter currents are calculated in the pure spinor formalism for type IIB superstring in the AdS5 × S5 background.

    Keywords
    AdS-CFT correspondence, Sigma models
    National Category
    Physical Sciences
    Research subject
    Theoretical Physics
    Identifiers
    urn:nbn:se:uu:diva-107321 (URN)10.1088/1126-6708/2006/10/057 (DOI)000242714400033 ()
    Available from: 2009-08-05 Created: 2009-08-05 Last updated: 2017-12-13Bibliographically approved
    2. Factorized world-sheet scattering in near-flat AdS5×S5
    Open this publication in new window or tab >>Factorized world-sheet scattering in near-flat AdS5×S5
    2008 (English)In: Nuclear Physics B, ISSN 0550-3213, E-ISSN 1873-1562, Vol. 792, no 3, p. 228-256Article in journal (Refereed) Published
    Abstract [en]

    We show the factorization of the three-particle world-sheet S-matrix of AdS5×S5 superstring theory in the near-flat-space limit at one loop order. This is done by computing various scattering amplitudes from Feynman diagrams in the world-sheet theory. The knowledge of certain highest weight amplitudes allows us to fix all the freedom in the three-particle S-matrix, which we argue to be constrained up to four scalar functions due to the symmetries of the model. We demonstrate that these amplitudes are given by corresponding products of the known two-particle S-matrix elements, from which it follows that the scattering of any three world-sheet excitations factorizes. This provides an explicit and direct check of the quantum integrability of string theory in near-flat AdS5×S5 as it renders evidence for the existence of higher conserved charges. By computing further amplitudes we also obtain an indirect confirmation of the supersymmetries of the near-flat-space model.

    Keywords
    AdS/CFT correspondence, S-matrix, Integrability, Factorized scattering
    National Category
    Physical Sciences
    Research subject
    Physics; Theoretical Physics
    Identifiers
    urn:nbn:se:uu:diva-107322 (URN)10.1016/j.nuclphysb.2007.09.018 (DOI)000253102400002 ()
    Available from: 2009-08-05 Created: 2009-08-05 Last updated: 2017-12-13Bibliographically approved
    3. Finite-size corrections in the SU(2)×SU(2) sector of type IIA string theory on AdS4 x CP3
    Open this publication in new window or tab >>Finite-size corrections in the SU(2)×SU(2) sector of type IIA string theory on AdS4 x CP3
    Show others...
    2009 (English)In: Nuclear Physics B, ISSN 0550-3213, E-ISSN 1873-1562, Vol. 810, no 1-2, p. 150-173Article in journal (Refereed) Published
    Abstract [en]

    We consider finite-size corrections in the SU(2)×SU(2) sector of type IIA string theory on , which is the string dual of the recently constructed  superconformal Chern–Simons theory of Aharony, Bergman, Jafferis and Maldacena (ABJM theory). The string states we consider are in the  subspace of  with an angular momentum J on  being large. We compute the finite-size corrections using two different methods, one is to consider curvature corrections to the Penrose limit giving an expansion in1/J, the other by considering a low energy expansion in λ=λ/J2 of the string theory sigma-model, λ being the 't Hooft coupling of the dual ABJM theory. For both methods there are interesting issues to deal with. In the near-pp-wave method there is a  interaction term for which we use zeta-function regularization in order to compute the 1/J correction to the energy. For the low energy sigma-model expansion we have to take into account a non-trivial coupling to a non-dynamical transverse direction. We find agreement between the two methods. At order λ and , for small λ, our results are analogous to the ones for the SU(2) sector in type IIB string theory on AdS5×S5. Instead at order  there are interactions between the two two-spheres. We compare our results with the recently proposed all-loop Bethe ansatz of Gromov and Vieira and find agreement.

    Keywords
    string theory, integrability
    National Category
    Physical Sciences
    Research subject
    Theoretical Physics
    Identifiers
    urn:nbn:se:uu:diva-107323 (URN)10.1016/j.nuclphysb.2008.10.020 (DOI)000262824200007 ()
    Available from: 2009-08-05 Created: 2009-08-05 Last updated: 2017-12-13Bibliographically approved
    4. Aspects of quantum integrability for pure spinor superstring in AdS5 × S5
    Open this publication in new window or tab >>Aspects of quantum integrability for pure spinor superstring in AdS5 × S5
    2008 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 09, p. 070-Article in journal (Refereed) Published
    Abstract [en]

    We consider the monodromy matrix for the pure spinor IIB superstring on AdS5 × S5 at leading order at strong coupling, in particular its variation under an infinitesimal and continuous deformation of the contour. Such variation is equivalent to the insertion of a local operator. Demanding the BRST-closure for such an operator rules out its existence, implying that the monodromy matrix remains contour-independent at the first order in perturbation theory. Furthermore we explicitly compute the field strength corresponding to the flat connections up to leading order and directly check that it is free from logarithmic divergences. The absence of anomaly in the coordinate transformation of the monodromy matrix and the UV-finiteness of the curvature tensor finally imply the integrability of the pure spinor superstring at the first order.

    Keywords
    AdS-CFT correspondence, Superstring and Heterotic string
    National Category
    Physical Sciences
    Research subject
    Theoretical Physics
    Identifiers
    urn:nbn:se:uu:diva-107324 (URN)10.1088/1126-6708/2008/09/070 (DOI)000259699700067 ()
    Available from: 2009-08-05 Created: 2009-08-05 Last updated: 2017-12-13Bibliographically approved
  • 10.
    Giangreco Marotta Puletti, Valentina
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Operator product expansion for pure spinor superstring on AdS5 x S52006In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 10, p. 057-Article in journal (Refereed)
    Abstract [en]

    The tree-level operator product expansion coefficients of the matter currents are calculated in the pure spinor formalism for type IIB superstring in the AdS5 × S5 background.

  • 11.
    Giangreco Marotta Puletti, Valentina
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Klose, Thomas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Theoretical Physics.
    Ohlsson Sax, Olof
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Theoretical Physics.
    Factorized world-sheet scattering in near-flat AdS5×S52008In: Nuclear Physics B, ISSN 0550-3213, E-ISSN 1873-1562, Vol. 792, no 3, p. 228-256Article in journal (Refereed)
    Abstract [en]

    We show the factorization of the three-particle world-sheet S-matrix of AdS5×S5 superstring theory in the near-flat-space limit at one loop order. This is done by computing various scattering amplitudes from Feynman diagrams in the world-sheet theory. The knowledge of certain highest weight amplitudes allows us to fix all the freedom in the three-particle S-matrix, which we argue to be constrained up to four scalar functions due to the symmetries of the model. We demonstrate that these amplitudes are given by corresponding products of the known two-particle S-matrix elements, from which it follows that the scattering of any three world-sheet excitations factorizes. This provides an explicit and direct check of the quantum integrability of string theory in near-flat AdS5×S5 as it renders evidence for the existence of higher conserved charges. By computing further amplitudes we also obtain an indirect confirmation of the supersymmetries of the near-flat-space model.

  • 12.
    Grumiller, Daniel
    et al.
    Massachusetts Institute of Technology.
    Jackiw, Roman
    Massachusetts Institute of Technology.
    Johansson, Niklas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Division of Theoretical Physics.
    Canonical analysis of cosmological topologically massive gravity at the chiral pointManuscript (Other academic)
    Abstract [en]

    Wolfgang Kummer was a pioneer of two-dimensional gravity and a strong advocate of the first order formulation in terms of Cartan variables. In the present work we apply Wolfgang Kummer's philosophy, the `Vienna School approach', to a specific three-dimensional model of gravity, cosmological topologically massive gravity at the chiral point. Exploiting a new Chern-Simons representation we perform a canonical analysis. The dimension of the physical phase space is two per point, and thus the theory exhibits a local physical degree of freedom, the topologically massive graviton.

  • 13.
    Grumiller, Daniel
    et al.
    Center for Theoretical Physics, Massachusetts Institute of Technology.
    Johansson, Niklas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Consistent boundary conditions for cosmological topologically massive gravity at the chiral point2008In: International Journal of Modern Physics D, ISSN 0218-2718, Vol. 17, no 13-14, p. 2367-2372Article in journal (Refereed)
    Abstract [en]

    We show that cosmological topologically massive gravity at the chiral point allows not only Brown-Henneaux boundary conditions as consistent boundary conditions, but slightly more general ones which encompass the logarithmic primary found in 0805.2610 as well as all its descendants.

  • 14.
    Grumiller, Daniel
    et al.
    Center for Theoretical Physics, Massachusetts Institute of Technology.
    Johansson, Niklas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Instability in cosmological topologically massive gravity at the chiral point2008In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 7, p. 134-Article in journal (Refereed)
    Abstract [en]

    We consider cosmological topologically massive gravity at the chiral point with positive sign of the Einstein-Hilbert term. We demonstrate the presence of a negative energy bulk mode that grows linearly in time. Unless there are physical reasons to discard this mode, this theory is unstable. To address this issue we prove that the mode is not pure gauge and that its negative energy is time-independent and finite. The isometry generators L0 and 0 have non-unitary matrix representations like in logarithmic CFT. While the new mode obeys boundary conditions that are slightly weaker than the ones by Brown and Henneaux, its fall-off behavior is compatible with spacetime being asymptotically AdS3. We employ holographic renormalization to show that the variational principle is well-defined. The corresponding Brown-York stress tensor coincides with that of global AdS3. Finally we address possibilities to eliminate the instability and prospects for chiral gravity.

  • 15. Hull, C. M.
    et al.
    Lindström, U.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    dos Santos, L. Melo
    von Unge, R.
    Zabzine, M.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Topological sigma models with H-flux2008In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 9, p. 057-Article in journal (Refereed)
    Abstract [en]

    We investigate the topological theory obtained by twisting the N = (2, 2) supersymmetric nonlinear sigma model with target a bihermitian space with torsion. For the special case in which the two complex structures commute, we show that the action is a Q-exact term plus a quasi-topological term. The quasi-topological term is locally given by a closed two-form which corresponds to a flat gerbe-connection and generalises the usual topological term of the A-model. Exponentiating it gives a Wilson surface, which can be regarded as a generalization of a Wilson line. This makes the quantum theory globally well-defined.

  • 16.
    Johansson, Niklas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Making Maps and Keeping Logs: Quantum Gravity from Classical Viewpoints2009Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis explores three different aspects of quantum gravity. First we study D3-brane black holes in Calabi-Yau compactifications of type IIB string theory. Using the OSV conjecture and a relation between topological strings and matrix models we show that some black holes have a matrix model description. This is the case if the attractor mechanism fixes the internal geometry to a conifold at the black hole horizon. We also consider black holes in a flux compactification and compare the effects of the black holes and fluxes on the internal geometry. We find that the fluxes dominate. Second, we study the scalar potential of type IIB flux compactifications. We demonstrate that monodromies of the internal geometry imply as a general feature the existence of long series of continuously connected minima. This allows for the embedding of scenarios such as chain inflation and resonance tunneling into string theory. The concept of monodromies is also extended to include geometric transitions: passing to a different Calabi-Yau topology, performing its monodromies and then returning to the original space allows for novel transformations. All constructions are performed explicitly, using both analytical and numerical techniques, in the mirror quintic Calabi-Yau. Third, we study cosmological topologically massive gravity at the chiral point, a prime candidate for quantization of gravity in three dimensions. The prospects of this scenario depend crucially of the stability of the theory. We demonstrate the presence of a negative energy bulk mode that grows logarithmically toward the AdS boundary. The AdS isometry generators have non-unitary matrix representations like in logarithmic CFT, and we propose that the CFT dual for this theory is logarithmic. In a complementing canonical analysis we also demonstrate the existence of this bulk degree of freedom, and we present consistent boundary conditions encompassing the new mode.

    List of papers
    1. 4D black holes and holomorphic factorization of the 0A matrix model
    Open this publication in new window or tab >>4D black holes and holomorphic factorization of the 0A matrix model
    Show others...
    2005 (English)In: Journal of High Energy Physics, Vol. 0510, p. 046-Article in journal (Refereed) Published
    Abstract [en]

    n this letter, we relate the free energy of the 0A matrix model to the sum of topological and anti-topological string amplitudes. For arbitrary integer multiples of the matrix model self-dual radius we describe the geometry on which the corresponding topological string propagates. This geometry is not the one that follows from the usual ground ring analysis, but in a sense its "holomorphic square root". Mixing of terms for different genus in the matrix model free energy yields one-loop terms compatible with type II strings on compact Calabi-Yau target spaces. As an application, we give an explicit example of how to relate the 0A matrix model free energy to that of a four-dimensional black hole in type IIB theory, compactified on a compact Calabi-Yau. Variables, Legendre transforms, and large classical terms on both sides match perfectly.

    Identifiers
    urn:nbn:se:uu:diva-79421 (URN)
    Available from: 2006-04-10 Created: 2006-04-10 Last updated: 2011-01-11
    2. Stability of flux vacua in the presence of charged black
    Open this publication in new window or tab >>Stability of flux vacua in the presence of charged black
    2006 (English)In: JHEP, Vol. 09, p. 069-Article in journal (Refereed) Published
    Abstract [en]

    In this letter we consider a charged black hole in a flux compactification of type IIB string theory. Both the black hole and the fluxes will induce potentials for the complex structure moduli. We choose the compact dimensions to be described locally by a deformed conifold, creating a large hierarchy. We demonstrate that the presence of a black hole typically will not change the minimum of the moduli potential in a substantial way. However, we also point out a couple of possible loop-holes, which in some cases could lead to interesting physical consequences such as changes in the hierarchy.

    Identifiers
    urn:nbn:se:uu:diva-20261 (URN)
    Available from: 2006-12-06 Created: 2006-12-06 Last updated: 2011-01-11
    3. The world next door: Results in landscape topography
    Open this publication in new window or tab >>The world next door: Results in landscape topography
    2007 (Swedish)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 03, p. 080-Article in journal (Refereed) Published
    Abstract [en]

    Recently, it has become clear that neighboring multiple vacua might have interesting consequences for the physics of the early universe. In this paper we investigate the topography of the string landscape corresponding to complex structure moduli of flux compactified type IIB string theory. We find that series of continuously connected vacua are common. The properties of these series are described, and we relate the existence of infinite series of minima to certain unresolved mathematical problems in group theory. Numerical studies of the mirror quintic serve as illustrating examples.

    Keywords
    Superstring Vacua, Flux compactifications, dS vacua in string theory
    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-13761 (URN)10.1088/1126-6708/2007/03/080 (DOI)000245922000080 ()
    Available from: 2008-01-25 Created: 2008-01-25 Last updated: 2017-12-11Bibliographically approved
    4. Deforming, revolving and resolving: New paths in the string theory landscape
    Open this publication in new window or tab >>Deforming, revolving and resolving: New paths in the string theory landscape
    Show others...
    2008 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 02, article id 016Article in journal (Refereed) Published
    Abstract [en]

    In this paper we investigate the properties of series of vacua in the string theory landscape. In particular, we study minima to the flux potential in type IIB compactifications on the mirror quintic. Using geometric transitions, we embed its one-dimensional complex structure moduli space in that of another Calabi-Yau with h1,1 = 86 and h2,1 = 2. We then show how to construct infinite series of continuously connected minima to the mirror quintic potential by moving into this larger moduli space, applying its monodromies, and moving back. We provide an example of such series, and discuss their implications for the string theory landscape

    Keywords
    Superstring Vacua, Flux compactifications
    National Category
    Physical Sciences
    Research subject
    Theoretical Physics
    Identifiers
    urn:nbn:se:uu:diva-100502 (URN)10.1088/1126-6708/2008/02/016 (DOI)000254764400096 ()
    Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2017-12-13Bibliographically approved
    5. Instability in cosmological topologically massive gravity at the chiral point
    Open this publication in new window or tab >>Instability in cosmological topologically massive gravity at the chiral point
    2008 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 7, p. 134-Article in journal (Refereed) Published
    Abstract [en]

    We consider cosmological topologically massive gravity at the chiral point with positive sign of the Einstein-Hilbert term. We demonstrate the presence of a negative energy bulk mode that grows linearly in time. Unless there are physical reasons to discard this mode, this theory is unstable. To address this issue we prove that the mode is not pure gauge and that its negative energy is time-independent and finite. The isometry generators L0 and 0 have non-unitary matrix representations like in logarithmic CFT. While the new mode obeys boundary conditions that are slightly weaker than the ones by Brown and Henneaux, its fall-off behavior is compatible with spacetime being asymptotically AdS3. We employ holographic renormalization to show that the variational principle is well-defined. The corresponding Brown-York stress tensor coincides with that of global AdS3. Finally we address possibilities to eliminate the instability and prospects for chiral gravity.

    Keywords
    AdS-CFT Correspondence, Classical Theories of Gravity, Models of Quantum Gravity
    National Category
    Other Physics Topics
    Research subject
    Physics
    Identifiers
    urn:nbn:se:uu:diva-100498 (URN)10.1088/1126-6708/2008/07/134 (DOI)000258144100134 ()
    Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2017-12-13Bibliographically approved
    6. Canonical analysis of cosmological topologically massive gravity at the chiral point
    Open this publication in new window or tab >>Canonical analysis of cosmological topologically massive gravity at the chiral point
    (English)Manuscript (Other academic)
    Abstract [en]

    Wolfgang Kummer was a pioneer of two-dimensional gravity and a strong advocate of the first order formulation in terms of Cartan variables. In the present work we apply Wolfgang Kummer's philosophy, the `Vienna School approach', to a specific three-dimensional model of gravity, cosmological topologically massive gravity at the chiral point. Exploiting a new Chern-Simons representation we perform a canonical analysis. The dimension of the physical phase space is two per point, and thus the theory exhibits a local physical degree of freedom, the topologically massive graviton.

    National Category
    Other Physics Topics
    Research subject
    Physics
    Identifiers
    urn:nbn:se:uu:diva-100501 (URN)
    Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2010-01-14
    7. Consistent boundary conditions for cosmological topologically massive gravity at the chiral point
    Open this publication in new window or tab >>Consistent boundary conditions for cosmological topologically massive gravity at the chiral point
    2008 (English)In: International Journal of Modern Physics D, ISSN 0218-2718, Vol. 17, no 13-14, p. 2367-2372Article in journal (Refereed) Published
    Abstract [en]

    We show that cosmological topologically massive gravity at the chiral point allows not only Brown-Henneaux boundary conditions as consistent boundary conditions, but slightly more general ones which encompass the logarithmic primary found in 0805.2610 as well as all its descendants.

    Keywords
    Cosmological topologically massive gravity, Brown–Henneaux boundary conditions, chiral gravity, gravity in three dimensions, logarithmic CFT, AdS/CFT
    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-100493 (URN)10.1142/S0218271808014096 (DOI)000264138700003 ()
    Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2017-12-13Bibliographically approved
  • 17.
    Johnson, Matthew C
    et al.
    California Institute of Technology.
    Larfors, Magdalena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Division of Theoretical Physics.
    Field dynamics and tunneling in a flux landscape2008In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 78, no 8, p. 0835341-08353423Article in journal (Refereed)
  • 18.
    Johnson, Matthew C
    et al.
    California Institute of Technology.
    Larfors, Magdalena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Division of Theoretical Physics.
    Obstacle to populating the string theory landscape2008In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 78, no 12, p. 1235131-1235135Article in journal (Refereed)
    Abstract [en]

    We construct domain walls and instantons in a class of models with coupled scalar fields, determining, in agreement with previous studies, that many such solutions contain naked timelike singularities. Vacuum bubble solutions of this type do not contain a region of true vacuum, obstructing the ability of eternal inflation to populate other vacua. We determine a criterion that potentials must satisfy to avoid the existence of such singularities and show that many domain wall solutions in type IIB string theory are singular.

  • 19. Kuzenko, S. M.
    et al.
    Lindström, U.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Rocek, M.
    Tartaglino-Mazzucchelli, G.
    4D N=2 supergravity and projective superspace2008In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 9, p. 051-Article in journal (Refereed)
    Abstract [en]

    This paper presents a projective superspace formulation for 4D N = 2 matter-coupled supergravity. We first describe a variant superspace realization for the N = 2 Weyl multiplet. It differs from that proposed by Howe in 1982 by the choice of the structure group SO(3, 1) x SU(2) versus SO(3, 1) x U( 2)), which implies that the super-Weyl transformations are generated by a covariantly chiral parameter instead of a real unconstrained one. We introduce various off-shell supermultiplets which are curved superspace analogues of the superconformal projective multiplets in global supersymmetry and which describe matter fields coupled to supergravity. A manifestly locally supersymmetric and super-Weyl invariant action principle is given. Off-shell locally supersymmetric nonlinear sigma models are presented in this new superspace.

  • 20.
    Larfors, Magdalena
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Pierced, Wrapped and Torn: Aspects of String Theory Compactifications2009Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    An outstanding problem in physics is to find a unified framework for quantum mechanics and general relativity. This is required for a better understanding of black holes and the early cosmology of the universe. String theory provides such a unification. In this thesis, we study aspects of compactifications of type IIB string theory. In the first part of the thesis, we study four-dimensional black holes consisting of D3-branes wrapping cycles in the compact dimensions. We discuss the correspondence between these black holes, topological string theory and matrix models. We then study the influence of black holes on the stability of flux compactifications. In the second part of the thesis, we turn to investigations of the type IIB landscape, i.e. the collection of stable and metastable vacua obtained from flux compactifications on conformal Calabi-Yau manifolds. We show that monodromies are important for the topographic structure of the landscape. In particular we find that there are long series of continuously connected vacua in the complex structure moduli space of the internal manifold. We also use geometric transitions to connect the moduli spaces of different manifolds, and create longer series of vacua. Finally, we investigate the stability of string theory vacua by constructing semiclassical instantons. These results have implications for the population of the landscape by eternal inflation.

    List of papers
    1. Deforming, revolving and resolving: New paths in the string theory landscape
    Open this publication in new window or tab >>Deforming, revolving and resolving: New paths in the string theory landscape
    Show others...
    2008 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 02, article id 016Article in journal (Refereed) Published
    Abstract [en]

    In this paper we investigate the properties of series of vacua in the string theory landscape. In particular, we study minima to the flux potential in type IIB compactifications on the mirror quintic. Using geometric transitions, we embed its one-dimensional complex structure moduli space in that of another Calabi-Yau with h1,1 = 86 and h2,1 = 2. We then show how to construct infinite series of continuously connected minima to the mirror quintic potential by moving into this larger moduli space, applying its monodromies, and moving back. We provide an example of such series, and discuss their implications for the string theory landscape

    Keywords
    Superstring Vacua, Flux compactifications
    National Category
    Physical Sciences
    Research subject
    Theoretical Physics
    Identifiers
    urn:nbn:se:uu:diva-100502 (URN)10.1088/1126-6708/2008/02/016 (DOI)000254764400096 ()
    Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2017-12-13Bibliographically approved
    2. The world next door: Results in landscape topography
    Open this publication in new window or tab >>The world next door: Results in landscape topography
    2007 (Swedish)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 03, p. 080-Article in journal (Refereed) Published
    Abstract [en]

    Recently, it has become clear that neighboring multiple vacua might have interesting consequences for the physics of the early universe. In this paper we investigate the topography of the string landscape corresponding to complex structure moduli of flux compactified type IIB string theory. We find that series of continuously connected vacua are common. The properties of these series are described, and we relate the existence of infinite series of minima to certain unresolved mathematical problems in group theory. Numerical studies of the mirror quintic serve as illustrating examples.

    Keywords
    Superstring Vacua, Flux compactifications, dS vacua in string theory
    National Category
    Physical Sciences
    Identifiers
    urn:nbn:se:uu:diva-13761 (URN)10.1088/1126-6708/2007/03/080 (DOI)000245922000080 ()
    Available from: 2008-01-25 Created: 2008-01-25 Last updated: 2017-12-11Bibliographically approved
    3. Stability of flux vacua in the presence of charged black
    Open this publication in new window or tab >>Stability of flux vacua in the presence of charged black
    2006 (English)In: JHEP, Vol. 09, p. 069-Article in journal (Refereed) Published
    Abstract [en]

    In this letter we consider a charged black hole in a flux compactification of type IIB string theory. Both the black hole and the fluxes will induce potentials for the complex structure moduli. We choose the compact dimensions to be described locally by a deformed conifold, creating a large hierarchy. We demonstrate that the presence of a black hole typically will not change the minimum of the moduli potential in a substantial way. However, we also point out a couple of possible loop-holes, which in some cases could lead to interesting physical consequences such as changes in the hierarchy.

    Identifiers
    urn:nbn:se:uu:diva-20261 (URN)
    Available from: 2006-12-06 Created: 2006-12-06 Last updated: 2011-01-11
    4. 4D black holes and holomorphic factorization of the 0A matrix model
    Open this publication in new window or tab >>4D black holes and holomorphic factorization of the 0A matrix model
    Show others...
    2005 (English)In: Journal of High Energy Physics, Vol. 0510, p. 046-Article in journal (Refereed) Published
    Abstract [en]

    n this letter, we relate the free energy of the 0A matrix model to the sum of topological and anti-topological string amplitudes. For arbitrary integer multiples of the matrix model self-dual radius we describe the geometry on which the corresponding topological string propagates. This geometry is not the one that follows from the usual ground ring analysis, but in a sense its "holomorphic square root". Mixing of terms for different genus in the matrix model free energy yields one-loop terms compatible with type II strings on compact Calabi-Yau target spaces. As an application, we give an explicit example of how to relate the 0A matrix model free energy to that of a four-dimensional black hole in type IIB theory, compactified on a compact Calabi-Yau. Variables, Legendre transforms, and large classical terms on both sides match perfectly.

    Identifiers
    urn:nbn:se:uu:diva-79421 (URN)
    Available from: 2006-04-10 Created: 2006-04-10 Last updated: 2011-01-11
    5. Field dynamics and tunneling in a flux landscape
    Open this publication in new window or tab >>Field dynamics and tunneling in a flux landscape
    2008 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 78, no 8, p. 0835341-08353423Article in journal (Refereed) Published
    Place, publisher, year, edition, pages
    American Physical Society, 2008
    National Category
    Other Physics Topics
    Research subject
    Physics
    Identifiers
    urn:nbn:se:uu:diva-100308 (URN)10.1103/PhysRevD.78.083534 (DOI)
    Available from: 2009-03-30 Created: 2009-03-30 Last updated: 2017-12-13Bibliographically approved
    6. Obstacle to populating the string theory landscape
    Open this publication in new window or tab >>Obstacle to populating the string theory landscape
    2008 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 78, no 12, p. 1235131-1235135Article in journal (Refereed) Published
    Abstract [en]

    We construct domain walls and instantons in a class of models with coupled scalar fields, determining, in agreement with previous studies, that many such solutions contain naked timelike singularities. Vacuum bubble solutions of this type do not contain a region of true vacuum, obstructing the ability of eternal inflation to populate other vacua. We determine a criterion that potentials must satisfy to avoid the existence of such singularities and show that many domain wall solutions in type IIB string theory are singular.

    Place, publisher, year, edition, pages
    American Physical Society, 2008
    National Category
    Physical Sciences
    Research subject
    Theoretical Physics
    Identifiers
    urn:nbn:se:uu:diva-100500 (URN)10.1103/PhysRevD.78.123513 (DOI)
    Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2017-12-13Bibliographically approved
  • 21.
    Minahan, Joseph A.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Ohlsson Sax, Olof
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Finite size effects for giant magnons on physical strings2008In: Nuclear Physics B, ISSN 0550-3213, E-ISSN 1873-1562, Vol. 801, no 1-2, p. 97-117Article in journal (Refereed)
    Abstract [en]

    Using finite gap methods, we find the leading order finite size corrections for an arbitrary number of giant magnons on physical strings, where the sum of the momenta is a multiple of 2π. Our results are valid for the Hofman-Maldacena fundamental giant magnons as well as their dyonic generalizations. The energy corrections turn out to be surprisingly simple, especially if all the magnons are fundamental, and at leading order are independent of the magnon flavors. We also show how to use the Bethe ansatz to find finite size corrections for dyonic giant magnons with large R-charges.

  • 22.
    Ohlsson Sax, Olof
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Astronomy, Division of Theoretical Physics.
    Finite size giant magnons and interactions2008In: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 39, no 12, p. 3143-3152Article in journal (Other academic)
    Abstract [en]

    Magnon interactions give important contributions to the wrapping interactions of the N=4 spin-chain. Similar effects are expected for the finite size corrections to the giant magnon energy in AdS5 ×S5. In this paper I review the finite gap description of giant magnons and the leading order calculation of the finite size corrections to the giant magnon dispersion relation for multi-magnon states

  • 23. Perz, Jan
    et al.
    Smyth, Paul
    Van Riet, Thomas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Vercnocke, Bert
    Black holes, first-order flow equations and geodesics on symmetric spaces2009In: Fortschritte der Physik, ISSN 0015-8208, E-ISSN 1521-3978, Vol. 57, no 5-7, p. 659-665Article in journal (Refereed)
    Abstract [en]

    For both extremal and non-extremal spherically symmetric black holes in theories with massless scalars and vectors coupled to gravity, we derive a general form of first-order gradient flow equations, equivalent to the equations of motion. For theories that have a symmetric moduli space after a dimensional reduction over the timelike direction, we discuss the condition for such a gradient flow to exist.

  • 24. Rodina, A. V.
    et al.
    Alekseev, A. Yu.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Theory of intrinsic electric polarization and spin Hall current in spin-orbit-coupled semiconductor heterostructures2008In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 78, no 11, p. 115304-Article in journal (Refereed)
    Abstract [en]

    We present Maxwell equations with source terms for the electromagnetic field interacting with a moving electron in a spin-orbit-coupled semiconductor heterostructure. We start with the eight-band kp model and derive the electric and magnetic polarization vectors using the Gordon-type decomposition method. Next, we present the kp effective Lagrangian for the nonparabolic conduction-band electrons interacting with electromagnetic field in semiconductor heterostructures with abrupt interfaces. This Lagrangian gives rise to the Maxwell equations with source terms and boundary conditions at heterointerfaces, as well as equations for the electron envelope wave function in the external electromagnetic field, together with appropriate boundary conditions. As an example, we consider spin-orbit effects caused by the structure inversion asymmetry for the conduction-electron states. We compute the intrinsic contribution to the electric polarization of the electron gas in asymmetric quantum well in equilibrium and in the stationary spin Hall regime. We argue that this contribution, as well as the intrinsic spin Hall current, are not cancelled by the elastic-scattering processes.

  • 25.
    Sax, Olof Ohlsson
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
    Finite size giant magnons and interactions2008In: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 39, no 12, p. 3143-3152Article in journal (Refereed)
    Abstract [en]

    Magnon interactions give important contributions to the wrapping interactions of the N = 4 spin-chain. Similar effects are expected for the finite size corrections to the giant magnon energy in AdS(5) X S-5. In this paper I review the finite gap description of giant magnons and the leading order calculation of the finite size corrections to the giant magnon dispersion relation for multi-magnon states.

  • 26.
    Łukowski, Tomasz
    et al.
    Institute of Physics, Jagellonian University.
    Ohlsson Sax, Olof
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Physics and Astronomy, Division of Theoretical Physics.
    Finite size giant magnons in the SU(2) × SU(2) sector of AdS4 × CP32008In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 12, p. 073-Article in journal (Refereed)
    Abstract [en]

    We use the algebraic curve and Lüscher's μ-term to calculate the leading order finite size corrections to the dispersion relation of giant magnons in the SU(2) × SU(2) sector of AdS4 × CP3. We consider a single magnon as well as one magnon in each SU(2). In addition the algebraic curve computation is generalized to give the leading order correction for an arbitrary multi-magnon state in the SU(2) × SU(2) sector.

1 - 26 of 26
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