WZW branes and gerbes

Abstract

We reconsider the role that bundle gerbes play in the formulation of the WZW model on closed and open surfaces. In particular, we show how an analysis of bundle gerbes on groups covered by SU(N) permits to determine the spectrum of symmetric branes in the boundary version of the WZW model with such groups as the target. We also describe a simple relation between the open string amplitudes in the WZW models based on simply connected groups and in their simple-current orbifolds.

latex, 4 figures incorporated

References in corpus (4)

• Twisted K-theory and K-theory of bundle gerbes
• Conformal Boundary Conditions and what they teach us
• Open Strings in Simple Current Orbifolds
• The basic gerbe over a compact simple Lie group

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