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Opens strings in simple current orbifolds
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.
2002 (English)In: Nuclear Physics B, ISSN 0550-3213, Vol. 626, no 1-2, 53-72 p.Article in journal (Refereed) Published
Abstract [en]

We study branes and open strings in a large class of orbifold backgrounds using microscopic techniques of boundary conformal field theory. In particular, we obtain factorizing operator product expansions of open string vertex operators for such branes. Applications include branes in orbifolds of the SU(2) WZW model and in the D-series of unitary minimal models considered previously by Runkel.

Place, publisher, year, edition, pages
2002. Vol. 626, no 1-2, 53-72 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-92032DOI: 10.1016/S0550-3213(02)00054-8OAI: oai:DiVA.org:uu-92032DiVA: diva2:164973
Available from: 2004-09-09 Created: 2004-09-09 Last updated: 2013-07-10Bibliographically approved
In thesis
1. Strings, Conformal Field Theory and Noncommutative Geometry
Open this publication in new window or tab >>Strings, Conformal Field Theory and Noncommutative Geometry
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes some aspects of noncommutative geometry and conformal field theory. The motivation for the investigations made comes to a large extent from string theory. This theory is today considered to be the most promising way to find a solution to the problem of unifying the four fundamental interactions in one single theory. The thesis gives a short background presentation of string theory and points out how noncommutative geometry and conformal field theory are of relevance within the string theoretical framework. There is also given some further information on noncommutative geometry and conformal field theory. The results from the three papers on which the thesis is based are presented in the text. It is shown in Paper 1 that, for a gauge theory in a flat noncommutative background only the gauge groups U(N) can be used in a straightforward way. These theories can arise as low energy limits of string theory. Paper 2 concerns boundary conformal field theory, which can be used to describe open strings in various backgrounds. Here different orbifold theories which are described using simple currents of the chiral algebra are investigated. The formalism is applied to ``branes´´ in Z2 orbifolds of the SU(2) WZW-model and to the D-series of unitary minimal models. In Paper 3 two different descriptions of an invariant star-product on are compared and the characteristic class that classifies the star-product is calculated. The Fedosov-Nest-Tsygan index theorem is used to compute the characteristic class.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 54 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 1004
Keyword
Theoretical physics, Theoretical physics, String theory, Conformal field theory, Noncommutative geometry, Star-products, Teoretisk fysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-4508 (URN)91-554-6019-4 (ISBN)
Public defence
2004-10-02, Polhemssalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15
Opponent
Supervisors
Available from: 2004-09-09 Created: 2004-09-09 Last updated: 2013-07-10Bibliographically approved
2. Topics on D-branes and Holography
Open this publication in new window or tab >>Topics on D-branes and Holography
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

We discuss various aspects of D-branes in string theory and holography in string theory and loop quantum gravity.

One way to study D-branes is from a microscopic perspective, using conformal field theory techniques. For example, we investigate the question of how D-branes can be introduced into orbifolded theories. Another way to study D-branes is from a space-time perspective. An example is provided by unstable D-branes, where we compute an effective action describing the decay of a bosonic D-brane.

The holographic principle is a proposed duality which suggests that a theory in any region has a dual description on the boundary. We explore two examples: (1) The area law for the entropy of a black hole in the framework of loop quantum gravity, related to particular regularizations of the area operator. (2) The AdS/CFT correspondence proposal, where we investigate a string pulsating on AdS using spin chains.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 90 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 998
Keyword
Theoretical physics, theoretical physics, string theory, D-branes, dualities, AdS/CFT, spin chains, Bethe ansatz, boundary conformal field theory, conformal bootstrap, tachyon condensation, string field theory, loop quantum gravity, black holes, area spectrum, Hawking radiation, holographic principle, Teoretisk fysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-4478 (URN)91-554-6012-7 (ISBN)
Public defence
2004-09-23, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15
Opponent
Supervisors
Available from: 2004-09-01 Created: 2004-09-01 Last updated: 2013-07-10Bibliographically approved

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Matsubara, Keizo

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