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On small tension p-branes
Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
2008 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 662, no 3, 270-274 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2008. Vol. 662, no 3, 270-274 p.
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-2035DOI: 10.1016/j.physletb.2008.03.013OAI: oai:DiVA.org:kau-2035DiVA: diva2:5562
Available from: 2008-05-19 Created: 2008-05-19 Last updated: 2011-11-10Bibliographically approved
In thesis
1. Strings, Branes and Non-trivial Space-times
Open this publication in new window or tab >>Strings, Branes and Non-trivial Space-times
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis deals with different aspects of string and /p/-brane theories. One of the motivations for string theory is to unify the forces in nature and produce a quantum theory of gravity. /p/-branes and related objects arise in string theory and are related to a non-perturbative definition of the theory. The results of this thesis might help in understanding string theory better. The first part of the thesis introduces and discusses relevant topics for the second part of the thesis which consists of five papers.

In the three first papers we develop and treat a perturbative approach to relativistic /p/-branes around stretched geometries. The unperturbed theory is described by a string- or particle-like theory. The theory is solved, within perturbation theory, by constructing successive canonical transformations which map the theory to the unperturbed one order by order. The result is used to define a quantum theory which requires for consistency d = 25 + p dimensions for the bosonic /p/-branes and d = 11 for the supermembrane. This is one of the first quantum results for extended objects beyond string theory and is a confirmation of the expectation of an eleven-dimensional quantum membrane.

The two last papers deal with a gauged WZNW-approach to strings moving on non-trivial space-times. The groups used in the formulation of these models are connected to Hermitian symmetric spaces of non-compact type. We have found that the GKO-construction does not yield a unitary spectrum. We will show that there exists, however, a different approach, the BRST approach, which gives unitarity under certain conditions. This is the first example of a difference between the GKO- and BRST construction. This is one of the first proofs of unitarity of a string theory in a non-trivial non-compact space-time. Furthermore, new critical string theories in dimensions less then 26 or 10 is found for the bosonic and supersymmetric string, respectively.

Place, publisher, year, edition, pages
Karlstad: Karlstad University, 2008. 116 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2008:20
Keyword
String theory, Membranes, BRST, /p/-branes, /p/-branes, Non-compact backgrounds, WZNW-model, No-ghost theorem, Unitarity, Hermitian symmetric spaces, CFT
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-1619 (URN)978-91-7063-179-5 (ISBN)
Public defence
2008-06-09, 1B306, 1B, Universitetsgatan 2, Karlstad, 13:15
Opponent
Supervisors
Available from: 2008-05-19 Created: 2008-05-19 Last updated: 2011-11-10

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CiteExportLink to record
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Citation style
  • apa
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