Modular categories of types B,C and D
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We construct four series of modular categories from the two-variable Kauffman polynomial, without use of the representation theory of quantum groups at roots of unity. The specializations of this polynomial corresponding to quantum groups of types B, C and D produce series of pre-modular categories. One of them turns out to be modular and three others satisfy Bruguières' modularization criterion. For these four series we compute the Verlinde formulas, and discuss spin and cohomological refinements.
32 pages, LaTeX with figures, Comment. Math. Helv. 2001
32 pages, LaTeX with figures, Comment. Math. Helv. 2001