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The world next door: Results in landscape topography
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Theoretical Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Theoretical Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Theoretical Physics.
2007 (Swedish)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 03, 080- p.Article in journal (Refereed) Published
Abstract [en]

Recently, it has become clear that neighboring multiple vacua might have interesting consequences for the physics of the early universe. In this paper we investigate the topography of the string landscape corresponding to complex structure moduli of flux compactified type IIB string theory. We find that series of continuously connected vacua are common. The properties of these series are described, and we relate the existence of infinite series of minima to certain unresolved mathematical problems in group theory. Numerical studies of the mirror quintic serve as illustrating examples.

Place, publisher, year, edition, pages
2007. Vol. 03, 080- p.
Keyword [en]
Superstring Vacua, Flux compactifications, dS vacua in string theory
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-13761DOI: 10.1088/1126-6708/2007/03/080ISI: 000245922000080OAI: oai:DiVA.org:uu-13761DiVA: diva2:41531
Available from: 2008-01-25 Created: 2008-01-25 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Making Maps and Keeping Logs: Quantum Gravity from Classical Viewpoints
Open this publication in new window or tab >>Making Maps and Keeping Logs: Quantum Gravity from Classical Viewpoints
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis explores three different aspects of quantum gravity. First we study D3-brane black holes in Calabi-Yau compactifications of type IIB string theory. Using the OSV conjecture and a relation between topological strings and matrix models we show that some black holes have a matrix model description. This is the case if the attractor mechanism fixes the internal geometry to a conifold at the black hole horizon. We also consider black holes in a flux compactification and compare the effects of the black holes and fluxes on the internal geometry. We find that the fluxes dominate. Second, we study the scalar potential of type IIB flux compactifications. We demonstrate that monodromies of the internal geometry imply as a general feature the existence of long series of continuously connected minima. This allows for the embedding of scenarios such as chain inflation and resonance tunneling into string theory. The concept of monodromies is also extended to include geometric transitions: passing to a different Calabi-Yau topology, performing its monodromies and then returning to the original space allows for novel transformations. All constructions are performed explicitly, using both analytical and numerical techniques, in the mirror quintic Calabi-Yau. Third, we study cosmological topologically massive gravity at the chiral point, a prime candidate for quantization of gravity in three dimensions. The prospects of this scenario depend crucially of the stability of the theory. We demonstrate the presence of a negative energy bulk mode that grows logarithmically toward the AdS boundary. The AdS isometry generators have non-unitary matrix representations like in logarithmic CFT, and we propose that the CFT dual for this theory is logarithmic. In a complementing canonical analysis we also demonstrate the existence of this bulk degree of freedom, and we present consistent boundary conditions encompassing the new mode.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 140 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 638
Keyword
String theory, black holes in string theory, Calabi-Yau geometry, flux compactifications, three-dimensional gravity
National Category
Other Physics Topics
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:uu:diva-100504 (URN)978-91-554-7510-9 (ISBN)
Public defence
2009-05-20, Polhemsalen, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2009-04-28 Created: 2009-04-01 Last updated: 2009-04-30Bibliographically approved
2. 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://uk.arxiv.org/abs/hep-th/0612222

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Danielsson, UlfJohansson, NiklasLarfors, Magdalena

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