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Obstacle to populating the string theory landscape
California Institute of Technology.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
2008 (Engelska)Ingår i: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 78, nr 12, s. 1235131-1235135Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
American Physical Society , 2008. Vol. 78, nr 12, s. 1235131-1235135
Nationell ämneskategori
Fysik
Forskningsämne
teoretisk fysik
Identifikatorer
URN: urn:nbn:se:uu:diva-100500DOI: 10.1103/PhysRevD.78.123513OAI: oai:DiVA.org:uu-100500DiVA, id: diva2:210387
Tillgänglig från: 2009-04-01 Skapad: 2009-04-01 Senast uppdaterad: 2017-12-13Bibliografiskt granskad
Ingår i avhandling
1. Pierced, Wrapped and Torn: Aspects of String Theory Compactifications
Öppna denna publikation i ny flik eller fönster >>Pierced, Wrapped and Torn: Aspects of String Theory Compactifications
2009 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2009. s. 134
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 632
Nationell ämneskategori
Annan fysik
Forskningsämne
teoretisk fysik
Identifikatorer
urn:nbn:se:uu:diva-100503 (URN)978-91-554-7494-2 (ISBN)
Disputation
2009-05-15, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (Engelska)
Opponent
Handledare
Tillgänglig från: 2009-04-24 Skapad: 2009-04-01 Senast uppdaterad: 2009-05-11Bibliografiskt granskad

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Förlagets fulltexthttp://link.aps.org/doi/10.1103/PhysRevD.78.123513

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