Semisimplicity of the Deformations of the Subcharacter Algebra of an Abelian Group

Abstract

For those deformations that satisfy a certain non-degeneracy condition, we describe the structure of certain simple modules of the deformations of the subcharacter algebra of a finite group. For finite abelian groups, we prove that the deformation given by the inclusion of the natural numbers, which corresponds to the algebra generated by the fibred bisets over a field of characteristic zero, is not semisimple. In the cyclic group of prime order case, we provide a complete description of the semisimple deformations. 2010 Mathematics Subject Classification: Primary 19A22, Secondary 16B50.