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Bi-branes: Target space geometry for world sheet topological defects
Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.ORCID iD: 0000-0003-4081-6234
2008 (English)In: Journal of Geom. and Physics 58 (2008)Article in journal (Refereed)
Abstract [en]

We establish that the relevant geometric data for the target space description of world sheet topological defects are submanifolds - which we call bi-branes - in the product M1 x M2 of the two target spaces involved. Very much like branes, they are equipped with a vector bundle, which in backgrounds with non-trivial B-field is actually a twisted vector bundle. We explain how to define Wess-Zumino terms in the presence of bi-branes and discuss the fusion of bi-branes.

In the case of WZW theories, symmetry preserving bi-branes are shown to be biconjugacy classes. The algebra of functions on a biconjugacy class is shown to be related, in the limit of large level, to the partition function for defect fields. We finally indicate how the Verlinde algebra arises in the fusion of WZW bi-branes

Place, publisher, year, edition, pages
2008.
National Category
Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-17396OAI: oai:DiVA.org:kau-17396DiVA: diva2:591002
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2014-11-21

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http://xxx.lanl.gov/abs/hep-th/0703145http://dx.doi.org/10.1016/j.geomphys.2007.12.009

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