Twisted Frobenius-Schur indicators for Hopf algebras

Abstract

The classical Frobenius-Schur indicators for finite groups are character sums defined for any representation and any integer m greater or equal to 2. In the familiar case m=2, the Frobenius-Schur indicator partitions the irreducible representations over the complex numbers into real, complex, and quaternionic representations. In recent years, several generalizations of these invariants have been introduced. Bump and Ginzburg, building on earlier work of Mackey, have defined versions of these indicators which are twisted by an automorphism of the group. In another direction, Linchenko and Montgomery have defined Frobenius-Schur indicators for semisimple Hopf algebras. In this paper, the authors construct twisted Frobenius-Schur indicators for semisimple Hopf algebras; these include all of the above indicators as special cases and have similar properties.

12 pages. Minor revisions

References in corpus (2)

• Congruence Subgroups and Generalized Frobenius-Schur Indicators
• Hopf Algebras and Congruence Subgroups

Cited by in corpus (6)

• The characteristic polynomial of the Adams operators on graded connected Hopf algebras
• Finite dimensional Hopf algebras over Kac-Paljutkin algebra $H_8$
• Noninvertible Symmetry-Resolved Affleck-Ludwig-Cardy Formula and Entanglement Entropy from the Boundary Tube Algebra
• Twisted Exponents and Twisted Frobenius-Schur Indicators for Hopf Algebras
• Frobenius-Schur theorem for $C^{\ast }$-categories
• Automorphism group of Suzuki's Hopf algebra