Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Stabilizing Antibrane Pseudomoduli
Cornell University, Department of Physics.
Cornell University, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
(English)Manuscript (preprint) (Other academic)
Abstract [en]

In a KKLT compactification, an anti-D3-brane at the tip of a warped deformed conifold region plays the crucial role of contributing positive vacuum energy. This antibrane also gives rise to light moduli, corresponding to angular motion around the tip. Following the work of Aharony, Antebi, and Berkooz, we characterize the leading effects due to compactification that lift these potentially dangerous pseudomoduli.We show that the dominant contribution to the anti-D3-brane potential arises from nonperturbative effects stabilizing the K\"ahler moduli. In ten-dimensional supergravity, this contribution is mediated by perturbations of three-form flux. Incorporating these flux perturbations, we compute the leading contribution to the potential for angular motion of the anti-D3-brane. We show that the resulting mass is parametrically larger than that obtained in prior work. However, we give a conclusive demonstration that bulk effects cannot stabilize the antibrane moduli above the IR scale without severe fine tuning.

National Category
Astronomy, Astrophysics and Cosmology
Research subject
Theoretical Physics
Identifiers
URN: urn:nbn:se:su:diva-74927OAI: oai:DiVA.org:su-74927DiVA: diva2:512948
Available from: 2012-03-29 Created: 2012-03-29 Last updated: 2012-03-30Bibliographically approved
In thesis
1. Cosmoparticle Physics and String Theory
Open this publication in new window or tab >>Cosmoparticle Physics and String Theory
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis deals with phenomenological and theoretical aspects of cosmoparticle physics and string theory. There are many open questions in these topics. In connection with cosmology we would like to understand the detailed properties of dark matter, dark energy, generation of primordial perturbations, etc., and in connection with particle physics we would like to understand the detailed properties of models that stabilize the electroweak scale, for instance supersymmetry. At the same time, we also need to understand these issues in a coherent theoretical framework. Such a framework is offered by string theory.

In this thesis, I analyze the interplay between Higgs and dark matter physics in an effective field theory extension of the minimally supersymmetric standard model. I study a theory of modified gravity, where the graviton has acquired a mass, and show the explicit implementation of the Vainshtein mechanism, which allows one to put severe constraints on the graviton mass. I address the question of Planck scale corrections to inflation in string theory, and show how such corrections can be tamed. I study perturbations of warped throat regions of IIB string theory compactifications and classify allowed boundary conditions. Using this analysis, I determine the potential felt by an anti-D3-brane in such compactifications, using the explicit harmonic data on the conifold. I also address questions of perturbative quantum corrections in string theory and calculate one-loop corrections to the moduli space metric of Calabi-Yau orientifolds.

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University, 2012. 107 p.
Keyword
Supersymmetry, dark matter, cosmology, inflation, modifications of gravity, string theory, flux compactifications, perturbative string theory
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:su:diva-74928 (URN)978-91-7447-492-3 (ISBN)
Public defence
2012-05-02, sal FA32, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows:  Paper 3: Manuscript. Paper 5: Manuscript. Paper 6: Manuscript.

Available from: 2012-04-10 Created: 2012-03-29 Last updated: 2012-03-30Bibliographically approved

Open Access in DiVA

No full text

Other links

http://www.physto.se/~stefans/

Search in DiVA

By author/editor
Sjörs, Stefan
By organisation
Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 92 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf