Solutions to generalized Yang-Baxter equations via ribbon fusion categories

preprint2012arXivOpen access

Abstract

Inspired by quantum information theory, we look for representations of the braid groups BnB_n on V⊗(n+m−2)V^{\otimes (n+m-2)} for some fixed vector space VV such that each braid generator σi,i=1,...,n−1,σ_i, i=1,...,n-1, acts on mm consecutive tensor factors from ii through i+m−1i+m-1. The braid relation for m=2m=2 is essentially the Yang-Baxter equation, and the cases for m>2m>2 are called generalized Yang-Baxter equations. We observe that certain objects in ribbon fusion categories naturally give rise to such representations for the case m=3m=3. Examples are given from the Ising theory (or the closely related SU(2)2SU(2)_2), SO(N)2SO(N)_2 for NN odd, and SU(3)3SU(3)_3. The solution from the Jones-Kauffman theory at a 6th6^{th} root of unity, which is closely related to SO(3)2SO(3)_2 or SU(2)4SU(2)_4, is explicitly described in the end.

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