uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • 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
Making Maps and Keeping Logs: Quantum Gravity from Classical Viewpoints
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
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. , p. 140
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 638
Keywords [en]
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: urn:nbn:se:uu:diva-100504ISBN: 978-91-554-7510-9 (print)OAI: oai:DiVA.org:uu-100504DiVA, id: diva2:210425
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
List of papers
1. 4D black holes and holomorphic factorization of the 0A matrix model
Open this publication in new window or tab >>4D black holes and holomorphic factorization of the 0A matrix model
Show others...
2005 (English)In: Journal of High Energy Physics, Vol. 0510, p. 046-Article in journal (Refereed) Published
Abstract [en]

n this letter, we relate the free energy of the 0A matrix model to the sum of topological and anti-topological string amplitudes. For arbitrary integer multiples of the matrix model self-dual radius we describe the geometry on which the corresponding topological string propagates. This geometry is not the one that follows from the usual ground ring analysis, but in a sense its "holomorphic square root". Mixing of terms for different genus in the matrix model free energy yields one-loop terms compatible with type II strings on compact Calabi-Yau target spaces. As an application, we give an explicit example of how to relate the 0A matrix model free energy to that of a four-dimensional black hole in type IIB theory, compactified on a compact Calabi-Yau. Variables, Legendre transforms, and large classical terms on both sides match perfectly.

Identifiers
urn:nbn:se:uu:diva-79421 (URN)
Available from: 2006-04-10 Created: 2006-04-10 Last updated: 2011-01-11
2. Stability of flux vacua in the presence of charged black
Open this publication in new window or tab >>Stability of flux vacua in the presence of charged black
2006 (English)In: JHEP, Vol. 09, p. 069-Article in journal (Refereed) Published
Abstract [en]

In this letter we consider a charged black hole in a flux compactification of type IIB string theory. Both the black hole and the fluxes will induce potentials for the complex structure moduli. We choose the compact dimensions to be described locally by a deformed conifold, creating a large hierarchy. We demonstrate that the presence of a black hole typically will not change the minimum of the moduli potential in a substantial way. However, we also point out a couple of possible loop-holes, which in some cases could lead to interesting physical consequences such as changes in the hierarchy.

Identifiers
urn:nbn:se:uu:diva-20261 (URN)
Available from: 2006-12-06 Created: 2006-12-06 Last updated: 2011-01-11
3. The world next door: Results in landscape topography
Open this publication in new window or tab >>The world next door: Results in landscape topography
2007 (Swedish)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 03, p. 080-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.

Keywords
Superstring Vacua, Flux compactifications, dS vacua in string theory
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-13761 (URN)10.1088/1126-6708/2007/03/080 (DOI)000245922000080 ()
Available from: 2008-01-25 Created: 2008-01-25 Last updated: 2017-12-11Bibliographically approved
4. Deforming, revolving and resolving: New paths in the string theory landscape
Open this publication in new window or tab >>Deforming, revolving and resolving: New paths in the string theory landscape
Show others...
2008 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 02, article id 016Article in journal (Refereed) Published
Abstract [en]

In this paper we investigate the properties of series of vacua in the string theory landscape. In particular, we study minima to the flux potential in type IIB compactifications on the mirror quintic. Using geometric transitions, we embed its one-dimensional complex structure moduli space in that of another Calabi-Yau with h1,1 = 86 and h2,1 = 2. We then show how to construct infinite series of continuously connected minima to the mirror quintic potential by moving into this larger moduli space, applying its monodromies, and moving back. We provide an example of such series, and discuss their implications for the string theory landscape

Keywords
Superstring Vacua, Flux compactifications
National Category
Physical Sciences
Research subject
Theoretical Physics
Identifiers
urn:nbn:se:uu:diva-100502 (URN)10.1088/1126-6708/2008/02/016 (DOI)000254764400096 ()
Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2017-12-13Bibliographically approved
5. Instability in cosmological topologically massive gravity at the chiral point
Open this publication in new window or tab >>Instability in cosmological topologically massive gravity at the chiral point
2008 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 7, p. 134-Article in journal (Refereed) Published
Abstract [en]

We consider cosmological topologically massive gravity at the chiral point with positive sign of the Einstein-Hilbert term. We demonstrate the presence of a negative energy bulk mode that grows linearly in time. Unless there are physical reasons to discard this mode, this theory is unstable. To address this issue we prove that the mode is not pure gauge and that its negative energy is time-independent and finite. The isometry generators L0 and 0 have non-unitary matrix representations like in logarithmic CFT. While the new mode obeys boundary conditions that are slightly weaker than the ones by Brown and Henneaux, its fall-off behavior is compatible with spacetime being asymptotically AdS3. We employ holographic renormalization to show that the variational principle is well-defined. The corresponding Brown-York stress tensor coincides with that of global AdS3. Finally we address possibilities to eliminate the instability and prospects for chiral gravity.

Keywords
AdS-CFT Correspondence, Classical Theories of Gravity, Models of Quantum Gravity
National Category
Other Physics Topics
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-100498 (URN)10.1088/1126-6708/2008/07/134 (DOI)000258144100134 ()
Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2017-12-13Bibliographically approved
6. Canonical analysis of cosmological topologically massive gravity at the chiral point
Open this publication in new window or tab >>Canonical analysis of cosmological topologically massive gravity at the chiral point
(English)Manuscript (Other academic)
Abstract [en]

Wolfgang Kummer was a pioneer of two-dimensional gravity and a strong advocate of the first order formulation in terms of Cartan variables. In the present work we apply Wolfgang Kummer's philosophy, the `Vienna School approach', to a specific three-dimensional model of gravity, cosmological topologically massive gravity at the chiral point. Exploiting a new Chern-Simons representation we perform a canonical analysis. The dimension of the physical phase space is two per point, and thus the theory exhibits a local physical degree of freedom, the topologically massive graviton.

National Category
Other Physics Topics
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-100501 (URN)
Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2010-01-14
7. Consistent boundary conditions for cosmological topologically massive gravity at the chiral point
Open this publication in new window or tab >>Consistent boundary conditions for cosmological topologically massive gravity at the chiral point
2008 (English)In: International Journal of Modern Physics D, ISSN 0218-2718, Vol. 17, no 13-14, p. 2367-2372Article in journal (Refereed) Published
Abstract [en]

We show that cosmological topologically massive gravity at the chiral point allows not only Brown-Henneaux boundary conditions as consistent boundary conditions, but slightly more general ones which encompass the logarithmic primary found in 0805.2610 as well as all its descendants.

Keywords
Cosmological topologically massive gravity, Brown–Henneaux boundary conditions, chiral gravity, gravity in three dimensions, logarithmic CFT, AdS/CFT
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-100493 (URN)10.1142/S0218271808014096 (DOI)000264138700003 ()
Available from: 2009-04-01 Created: 2009-04-01 Last updated: 2017-12-13Bibliographically approved

Open Access in DiVA

fulltext(1222 kB)827 downloads
File information
File name FULLTEXT01.pdfFile size 1222 kBChecksum SHA-512
6d8269392086e2a9df52d9de1c6191d232231ff6ee066eb1985f07fcde0136954a3d20f825dc4b1f702a472e69225b79800330a4ca769afca45af1d626547500
Type fulltextMimetype application/pdf
Buy this publication >>

Authority records BETA

Johansson, Niklas

Search in DiVA

By author/editor
Johansson, Niklas
By organisation
Theoretical Physics
Other Physics Topics

Search outside of DiVA

GoogleGoogle Scholar
Total: 827 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 1613 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • 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