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Dibitetto, Giuseppe
Publications (10 of 28) Show all publications
Dibitetto, G. & Petri, N. (2019). AdS(2) solutions and their massive IIA origin. Journal of High Energy Physics (JHEP) (5), Article ID 107.
Open this publication in new window or tab >>AdS(2) solutions and their massive IIA origin
2019 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 5, article id 107Article in journal (Refereed) Published
Abstract [en]

We consider warped AdS(2) x M-4 backgrounds within F(4) gauged supergravity in six dimensions. In particular, we are able to find supersymmetric solutions of the aforementioned type characterized by AdS(6) asymptotics and an M-4 given by a three-sphere warped over a segment. Subsequently, we provide the 10D uplift of the solutions to massive type IIA supergravity, where the geometry is AdS(2) x S-3 x S warped over a strip. Finally we construct the brane intersection underlying one of these supergravity backgrounds. The explicit setup involves a D0-F1-D4 bound state intersecting a D4-D8 system.

Place, publisher, year, edition, pages
SPRINGER, 2019
Keywords
AdS-CFT Correspondence, D-branes, Superstring Vacua
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-385975 (URN)10.1007/JHEP05(2019)107 (DOI)000468429700001 ()
Funder
Swedish Research Council
Note

ArXiv ePrint:1811.11572

Available from: 2019-06-19 Created: 2019-06-19 Last updated: 2019-06-19Bibliographically approved
Blaback, J., Danielsson, U., Dibitetto, G. & Giri, S. (2019). Constructing stable de Sitter in M-theory from higher curvature corrections. Journal of High Energy Physics (JHEP) (9), Article ID 042.
Open this publication in new window or tab >>Constructing stable de Sitter in M-theory from higher curvature corrections
2019 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 9, article id 042Article in journal (Refereed) Published
Abstract [en]

We consider dimensional reductions of M-theory on T-7/Z(2)(3) with the inclusion of arbitrary metric flux and spacetime filling KK monopoles. With these ingredients at hand, we are able to construct a novel family of non-supersymmetric yet tachyon free Minkowski extrema. These solutions are supported by pure geometry with no extra need for gauge fluxes and possess a fully stable perturbative mass spectrum, up to a single flat direction. Such a direction corresponds to the overall internal volume, with respect to which the scalar potential exhibits a no-scale behavior. We then provide a mechanism that lifts the flat direction to give it a positive squared mass while turning Mkw(4) into dS(4). The construction makes use of the combined effect of G(7) flux and higher curvature corrections. Our solution is scale separated and the quantum corrections are small. Finally we speculate on novel possibilities when it comes to scale hierarchies within a given construction of this type, and possible issues with the choice of quantum vacuum.

Place, publisher, year, edition, pages
SPRINGER, 2019
Keywords
Flux compactifications, M-Theory
National Category
Other Physics Topics
Identifiers
urn:nbn:se:uu:diva-396631 (URN)10.1007/JHEP09(2019)042 (DOI)000489133700001 ()
Funder
Swedish Research Council
Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2019-11-08Bibliographically approved
Dibitetto, G. & Petri, N. (2019). Surface defects in the D4-D8 brane system. Journal of High Energy Physics (JHEP) (1), Article ID 193.
Open this publication in new window or tab >>Surface defects in the D4-D8 brane system
2019 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 1, article id 193Article in journal (Refereed) Published
Abstract [en]

A new class of exact supersymmetric solutions is derived within minimal d = 6 F(4) gauged supergravity. These flows are all characterized by a non-trivial radial profile for the 2-form gauge potential included into the supergravity multiplet. In particular three solutions within this class are featured by an AdS(3) foliation of the 6d background and by an AdS(6) asymptotic geometry. Secondly, considering the simplest example of these, we give its massive IIA uplift describing a warped solution of the type AdS(3) x S-2 x S-3 fibered over two intervals I-r x I. We interpret this background as the near-horizon of a D4-D8 system on which a bound state D2-NS5-D6 ends producing a surface defect. Finally we discuss its holographic dual interpretation in terms of a N = (0, 4) SCFT2 defect theory within the N = 2 SCFT5 dual to the AdS(6) x S-4 massive IIA warped vacuum.

Keywords
AdS-CFT Correspondence, D-branes, Superstring Vacua
National Category
Other Physics Topics Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-377353 (URN)10.1007/JHEP01(2019)193 (DOI)000456803400002 ()
Available from: 2019-02-22 Created: 2019-02-22 Last updated: 2019-02-22Bibliographically approved
Dibitetto, G. & Petri, N. (2018). 6d surface defects from massive type IIA. Journal of High Energy Physics (JHEP) (1), Article ID 039.
Open this publication in new window or tab >>6d surface defects from massive type IIA
2018 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 1, article id 039Article in journal (Refereed) Published
Abstract [en]

We present a new BPS flow within minimal N = 1 supergravity in seven dimensions describing a warped AdS(3) background supported by a "dyonic" profile of the three-form. Furthermore, we discuss the holographic interpretation of the above solution in terms of a defect SCFT2 inside the 6d (1, 0) theory dual to the AdS in the asymptotic region. Finally we provide the brane picture of the aforementioned defect CFT as D2- and wrapped D4-branes ending on a D6 - NS5 - D8 funnel in massive type IIA string theory.

Place, publisher, year, edition, pages
SPRINGER, 2018
Keywords
D-branes, Supergravity Models, Conformal Field Models in String Theory
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-343385 (URN)10.1007/JHEP01(2018)039 (DOI)000422666300011 ()
Funder
Swedish Research CouncilGöran Gustafsson Foundation for Research in Natural Sciences and Medicine
Available from: 2018-02-28 Created: 2018-02-28 Last updated: 2018-02-28Bibliographically approved
Blåbäck, J., Danielsson, U. & Dibitetto, G. (2018). A new light on the darkest corner of the landscape.
Open this publication in new window or tab >>A new light on the darkest corner of the landscape
2018 (English)In: Article in journal (Refereed) Epub ahead of print
Abstract [en]

otivated by the recently proposed bounds on the slow-roll parameters forscalar potentials arising from string/M-theory compactifications, a.k.a. theRefined de Sitter Swampland conjecture, we explore the sharpness of suchconstraints within 4D supergravities coming from compactifications of massivetype IIA string theory onT6/(Z2×Z2). With the aid of a numerical technique,known as differential evolution, we are able to find a de Sitter extremum whichis fully metastable up to one single flat direction. This solution is supported byspacetime filling sources such as O6 planes and KK monopoles. Our exampleviolates the bound imposed by this conjecture

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-371288 (URN)
Available from: 2018-12-20 Created: 2018-12-20 Last updated: 2019-04-25Bibliographically approved
Dibitetto, G. & Passias, A. (2018). AdS(2) x S-7 solutions from D0-F1-D8 intersections. Journal of High Energy Physics (JHEP) (10), Article ID 190.
Open this publication in new window or tab >>AdS(2) x S-7 solutions from D0-F1-D8 intersections
2018 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 10, article id 190Article in journal (Refereed) Published
Abstract [en]

We study an exhaustive analytic class of massive type IIA backgrounds pre-serving sixteen real supercharges and enjoying SL(2, ) x SO(8) bosonic symmetry. The corresponding geometry is described by AdS(2) x S-7 warped over a line, which turns out to emerge from taking the near-horizon limit of D0-F1-D8 intersections. By studying the singularity structure of these solutions we find the possible presence of localized O8/D8 sources, as well as of fundamental strings smeared over the S-7. Finally we discuss the relation between the aforementioned solutions and the known AdS(7) x S-2 class through double analytic continuation.

Keywords
AdS-CFT Correspondence, D-branes, Flux compactifications
National Category
Other Physics Topics
Identifiers
urn:nbn:se:uu:diva-370021 (URN)10.1007/JHEP10(2018)190 (DOI)000449260800006 ()
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, KAW 2015.0083
Available from: 2018-12-19 Created: 2018-12-19 Last updated: 2018-12-19Bibliographically approved
Dibitetto, G., Lo Monaco, G., Passias, A., Petri, N. & Tomasiello, A. (2018). AdS3 solutions with exceptional supersymmetry. Fortschritte der Physik, 66(10), Article ID 1800060.
Open this publication in new window or tab >>AdS3 solutions with exceptional supersymmetry
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2018 (English)In: Fortschritte der Physik, ISSN 0015-8208, E-ISSN 1521-3978, Vol. 66, no 10, article id 1800060Article in journal (Refereed) Published
Abstract [en]

Among the possible superalgebras that contain the AdS3 isometries, two interesting possibilities are the exceptional F (4) and G(3). Their R-symmetry is respectively SO(7) and G(2), and the amount of supersymmetry N = 8 and N = 7. We find that there exist two (locally) unique solutions in type IIA supergravity that realize these superalgebras, and we provide their analytic expressions. In both cases, the internal space is obtained by a round six-sphere fibred over an interval, with an O8-plane at one end. The R-symmetry is the symmetry group of the sphere; in the G(3) case, it is broken to G(2) by fluxes. We also find several numerical N = 1 solutions with G(2) flavor symmetry, with various localized sources, including O2-planes and O8-planes.

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-371310 (URN)10.1002/prop.201800060 (DOI)000452428600005 ()
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, KAW2015.0083
Available from: 2018-12-20 Created: 2018-12-20 Last updated: 2019-01-21Bibliographically approved
Banerjee, S., Danielsson, U., Dibitetto, G., Giri, S. & Schillo, M. (2018). Emergent de Sitter cosmology from decaying Anti-de Sitter Space. Physical Review Letters, 121(26), Article ID 261301.
Open this publication in new window or tab >>Emergent de Sitter cosmology from decaying Anti-de Sitter Space
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2018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 26, article id 261301Article in journal (Refereed) Published
Abstract [en]

Recent developments in string compactifications demonstrate obstructions to the simplest constructions of low energy cosmologies with positive vacuum energy. The existence of obstacles to creating scale-separated de Sitter solutions indicates a UV/IR puzzle for embedding cosmological vacua in a unitary theory of quantum gravity. Motivated by this puzzle, we propose an embedding of positive energy Friedmann-Lemaitre-Robertson-Walker cosmology within string theory. Our proposal involves confining 4D gravity on a brane which mediates the decay from a nonsupersymmetric five-dimensional anti-de Sitter false vacuum to a true vacuum. In this way, it is natural for a 4D observer to experience an effective positive cosmological constant coupled to matter and radiation, avoiding the need for scale separation or a fundamental de Sitter vacuum.

National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-371313 (URN)10.1103/PhysRevLett.121.261301 (DOI)000454433200002 ()30636156 (PubMedID)
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, 113410212
Available from: 2018-12-20 Created: 2018-12-20 Last updated: 2019-01-15Bibliographically approved
Dibitetto, G., Riccioni, F. & Risoli, S. (2018). Space-filling branes & gaugings. Journal of High Energy Physics (JHEP) (7), Article ID 006.
Open this publication in new window or tab >>Space-filling branes & gaugings
2018 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 7, article id 006Article in journal (Refereed) Published
Abstract [en]

We consider in any dimension the supersymmetric Z(2) truncations of the maximal supergravity theories. In each dimension and for each truncation we determine all the sets of 1/2-BPS space-filling branes, i.e. branes whose world-volume invades the whole of space-time, that preserve the supersymmetry of the truncated theory and the representations of the symmetry of such theory to which they belong. We show that in any dimension below eight these sets always contain exotic branes, that are objects that do not have a ten-dimensional origin. We repeat the same analysis for half-maximal theories and for the quarter-maximal theories in four and three dimensions. We then discuss all the possible gaugings of these theories as described in terms of the embedding tensor. In general, the truncation acts on the quadratic constraints of the embedding tensor in such a way that some representations survive the truncation although they are not required by the supersymmetry of the truncated theory. We show that for any theory, among these representations, the highest-dimensional ones are precisely those of the 1/2-BPS space-filling branes that preserve the same supersymmetry of the truncated theory, and we interpret this result as the fact that these quadratic constraints after the truncation become tadpole conditions for such branes.

Place, publisher, year, edition, pages
SPRINGER, 2018
Keywords
Global Symmetries, p-branes, Supergravity Models, String Duality
National Category
Subatomic Physics Other Physics Topics
Identifiers
urn:nbn:se:uu:diva-361281 (URN)10.1007/JHEP07(2018)006 (DOI)000437355000006 ()
Funder
Swedish Research Council
Available from: 2018-09-27 Created: 2018-09-27 Last updated: 2018-09-27Bibliographically approved
Danielsson, U., Dibitetto, G. & Vargas, S. C. (2017). A swamp of non-SUSY vacua. Journal of High Energy Physics (JHEP), 2017(11), Article ID 152.
Open this publication in new window or tab >>A swamp of non-SUSY vacua
2017 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2017, no 11, article id 152Article in journal (Refereed) Published
Abstract [en]

We consider known examples of non-supersymmetric AdS7 and AdS4 solutions arising from compactifications of massive type IIA supergravity and study their stability, taking into account the coupling between closed- and open-string sector excitations. Generically, open strings are found to develop modes with masses below the Breitenlohner-Freedman (BF) bound. We comment on the relation with the Weak Gravity Conjecture, and how this analysis may play an important role in examining the validity of non-supersymmetric constructions in string theory.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2017
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-341010 (URN)10.1007/JHEP11(2017)152 (DOI)000416355700006 ()
Funder
Swedish Research Council
Available from: 2018-02-06 Created: 2018-02-06 Last updated: 2018-07-31Bibliographically approved
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