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Two-field high-scale inflation in a sub-Planckian region of field space
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
2010 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 81, no 10, 103535- p.Article in journal (Refereed) Published
Abstract [en]

We present a simple two-field model of inflation and show how to embed it in string theory as a straightforward generalization of axion monodromy models. Phenomenologically, the predictions are equivalent to those of chaotic inflation, and, in particular, include observably large tensor modes. The whole high-scale large-field inflationary dynamics takes place within a region of field space that is parametrically sub-Planckian in diameter, hence improving our ability to control quantum corrections and achieve slow-roll inflation.

Place, publisher, year, edition, pages
2010. Vol. 81, no 10, 103535- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-49912DOI: 10.1103/PhysRevD.81.103535ISI: 000278146700048OAI: oai:DiVA.org:su-49912DiVA: diva2:380335
Note
authorCount :3Available from: 2010-12-21 Created: 2010-12-20 Last updated: 2017-12-11Bibliographically 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

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