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Localised anti-branes in non-compact throats at zero and finite T
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
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2015 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 2, article id 018Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
2015. no 2, article id 018
Keywords [en]
dS vacua in string theory, Flux compactifications, Gauge-gravity correspondence, Black Holes in String Theory
National Category
Other Physics Topics
Identifiers
URN: urn:nbn:se:uu:diva-251530DOI: 10.1007/JHEP02(2015)018ISI: 000350689700001OAI: oai:DiVA.org:uu-251530DiVA, id: diva2:807138
Available from: 2015-04-22 Created: 2015-04-20 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)
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Available from: 2018-09-05 Created: 2018-07-30 Last updated: 2018-09-07

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