A spin decomposition of the Verlinde formula for type A modular categories

Details A spin decomposition of the Verlinde formula for type A modular categories A spin decomposition of the Verlinde formula for type A modular categories

2003-03-19

arxiv.org/abs/math/0303240v2

Comm. in Math. Physics, Vol. 257, N. 1, May 2005, 1 - 28

Mathematics

Quantum Algebra

34 pages

Scientific paper

A modular category is a braided category with some additional algebraic features. The interest of this concept is that it provides a Topological Quantum Field Theory in dimension 3. The Verlinde formulas associated with a modular category are the dimensions of the TQFT modules. We compute this formulas and discuss reductions and refinements for modular categories related with SU(N).Our main result is a splitting of the Verlinde formula, corresponding to a brick decomposition of the TQFT modules whose summands are indexed by spin structures modulo an even integer.We introduce the notion of a spin modular category, and give the proof of the decomposition theorem in this general context.

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