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Obstacle to populating the string theory landscape
California Institute of Technology.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Division of Theoretical Physics.
2008 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 78, no 12, 1235131-1235135 p.Article in journal (Refereed) Published
Abstract [en]

We construct domain walls and instantons in a class of models with coupled scalar fields, determining, in agreement with previous studies, that many such solutions contain naked timelike singularities. Vacuum bubble solutions of this type do not contain a region of true vacuum, obstructing the ability of eternal inflation to populate other vacua. We determine a criterion that potentials must satisfy to avoid the existence of such singularities and show that many domain wall solutions in type IIB string theory are singular.

Place, publisher, year, edition, pages
American Physical Society , 2008. Vol. 78, no 12, 1235131-1235135 p.
National Category
Physical Sciences
Research subject
Theoretical Physics
Identifiers
URN: urn:nbn:se:uu:diva-100500DOI: 10.1103/PhysRevD.78.123513OAI: oai:DiVA.org:uu-100500DiVA: diva2:210387
Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Pierced, Wrapped and Torn: Aspects of String Theory Compactifications
Open this publication in new window or tab >>Pierced, Wrapped and Torn: Aspects of String Theory Compactifications
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

An outstanding problem in physics is to find a unified framework for quantum mechanics and general relativity. This is required for a better understanding of black holes and the early cosmology of the universe. String theory provides such a unification. In this thesis, we study aspects of compactifications of type IIB string theory. In the first part of the thesis, we study four-dimensional black holes consisting of D3-branes wrapping cycles in the compact dimensions. We discuss the correspondence between these black holes, topological string theory and matrix models. We then study the influence of black holes on the stability of flux compactifications. In the second part of the thesis, we turn to investigations of the type IIB landscape, i.e. the collection of stable and metastable vacua obtained from flux compactifications on conformal Calabi-Yau manifolds. We show that monodromies are important for the topographic structure of the landscape. In particular we find that there are long series of continuously connected vacua in the complex structure moduli space of the internal manifold. We also use geometric transitions to connect the moduli spaces of different manifolds, and create longer series of vacua. Finally, we investigate the stability of string theory vacua by constructing semiclassical instantons. These results have implications for the population of the landscape by eternal inflation.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 134 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 632
National Category
Other Physics Topics
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:uu:diva-100503 (URN)978-91-554-7494-2 (ISBN)
Public defence
2009-05-15, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2009-04-24 Created: 2009-04-01 Last updated: 2009-05-11Bibliographically approved

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Publisher's full texthttp://link.aps.org/doi/10.1103/PhysRevD.78.123513

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Larfors, Magdalena

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