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Universal isolation in the AdS landscape
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.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
2016 (English)In: PHYSICAL REVIEW D, ISSN 2470-0010, Vol. 94, no 12, article id 126002Article in journal (Refereed) Published
Abstract [en]

We study the universal conditions for quantum nonperturbative stability against bubble nucleation for pertubatively stable AdS vacua based on positive energy theorems. We also compare our analysis with the preexisting ones in the literature carried out within the thin-wall approximation. The aforementioned criterion is then tested in two explicit examples describing massive type IIA string theory compactified on S-3 and S-3 x S-3, respectively. The AdS landscape of both classes of compactifications is known to consist of a set of isolated points. The main result is that all critical points respecting the Breitenlohner-Freedman (BF) bound also turn out be stable at a nonperturbative level. Finally, we speculate on the possible universal features that may be extracted from the above specific examples.

Place, publisher, year, edition, pages
2016. Vol. 94, no 12, article id 126002
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-311498DOI: 10.1103/PhysRevD.94.126002ISI: 000389028000011OAI: oai:DiVA.org:uu-311498DiVA, id: diva2:1060442
Funder
Swedish Research CouncilAvailable from: 2016-12-28 Created: 2016-12-28 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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