paper

Derivation of the Verlinde Formula from Chern-Simons Theory and the G/G model

arXiv:hep-th/9305010 · doi:10.1016/0550-3213(93)90538-Z

Abstract

We give a derivation of the Verlinde formula for the WZW model from Chern-Simons theory, without taking recourse to CFT, by calculating explicitly the partition function of with an arbitrary number of labelled punctures. By a suitable gauge choice, is reduced to the partition function of an Abelian topological field theory on (a deformation of non-Abelian BF and Yang-Mills theory) whose evaluation is straightforward. This relates the Verlinde formula to the Ray-Singer torsion of . We derive the model from Chern-Simons theory, proving their equivalence, and give an alternative derivation of the Verlinde formula by calculating the path integral via a functional version of the Weyl integral formula. From this point of view the Verlinde formula arises from the corresponding Jacobian, the Weyl determinant. Also, a novel derivation of the shift $k\ra k+h$ is given, based on the index of the twisted Dolbeault complex.

47 pages (in A4 format), LaTex file, (original was truncated by the mailer - apologies, m.b.), IC/93/83

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