Half-commutative orthogonal Hopf algebras

Abstract

A half-commutative orthogonal Hopf algebra is a Hopf *-algebra generated by the self-adjoint coefficients of an orthogonal matrix corepresentation $v=(v_{ij})$ that half commute in the sense that $abc=cba$ for any $a,b,c\in \{v_{ij}\}$. The first non-trivial such Hopf algebras were discovered by Banica and Speicher. We propose a general procedure, based on a crossed product construction, that associates to a self-transpose compact subgroup $G\subset U_n$ a half-commutative orthogonal Hopf algebra ${\mathcal{A}}_{\ast }(G)$. It is shown that any half-commutative orthogonal Hopf algebra arises in this way. The fusion rules of ${\mathcal{A}}_{\ast }(G)$ are expressed in term of those of $G$.

arXiv comment11 pages