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Universal dS vacua in STU-models
Univ Paris Saclay, Inst Phys Theor, CEA, CNRS, F-91191 Gif Sur Yvette, France..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2015 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 10, article id 069Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
2015. no 10, article id 069
Keywords [en]
Flux compactifications, dS vacua in string theory, String Duality
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-267222DOI: 10.1007/JHEP10(2015)069ISI: 000363555500004OAI: oai:DiVA.org:uu-267222DiVA, id: diva2:872454
Funder
Swedish Research CouncilAvailable from: 2015-11-19 Created: 2015-11-19 Last updated: 2018-07-31Bibliographically approved
In thesis
1. Vacua in String Theory: de Sitter Space and Stability in Flux Compactifications
Open this publication in new window or tab >>Vacua in String Theory: de Sitter Space and Stability in Flux Compactifications
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Our understanding of cosmology has evolved radically in the last decades. Current models demand the presence of dark energy in our universe and the most favored candidate behind this component is a small positive cosmological constant that characterizes a de Sitter (dS) spacetime. Simultaneously, theoretical physicists have stood up to the challenge of building a consistent theory of quantum gravity and string theory has raised as a strong contender.

In this thesis we present some explorations within supergravity, a low energy limit of string theory, studying non-supersymmetric vacua, its stability, and the possibility of finding dS.

We study the landscape of flux compactifications to produce dS with non-geometric fluxes. We find precise analytic procedures to find perturbatively stable dS near supersymmetric and no-scale Minkowski in a potential derived from type IIB compactifications. We also provide analytical evidence of naked singularities being produced in supergravity backgrounds after the introduction of anti-Dp-branes, at both vanishing and finite temperature.

In order to study the problem of semi-classical stability, we explore compactifications with anti-de Sitter as external space. We argue that truncations to closed-string-sector excitations of non-supersymmetric theories may be non-perturbatively protected by the existence of globally defined fake-superpotentials if they are perturbatively stable, a reasoning that goes in line with the standard positive energy theorems.

We find that non-supersymmetric solutions tend to manifest modes with masses under the Breitenlohner-Freedman bound once the open-string-sector is explored while supersymmetric solutions remain stable. We see this as a hint in the nature of the instabilities predicted by the weak gravity conjecture.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 69
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1655
Keywords
String theory, Cosmology, Flux Compactifications, Landscape, Swampland
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-356521 (URN)978-91-513-0299-7 (ISBN)
Public defence
2018-09-28, 80101, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2018-09-05 Created: 2018-07-30 Last updated: 2018-09-07

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Danielsson, Ulf H.Dibitetto, GiuseppeVargas, Sergio. C.
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