On finite group scheme-theoretical categories, II
Representation Theory
2025-09-12 v2
Abstract
Let be a finite group scheme-theoretical category over an algebraically closed field of characteristic as defined by the first author. For any indecomposable exact module category over , we classify its simple objects and provide an expression for their projective covers in terms of double cosets and projective representations of certain closed subgroup schemes of . This upgrades a result of Ostrik for group-theoretical fusion categories in characteristic , and generalizes our previous work for the case . As a byproduct, we describe the simples and indecomposable projectives of . Finally, we apply our results to describe the blocks of the center of .
Cite
@article{arxiv.2403.08785,
title = {On finite group scheme-theoretical categories, II},
author = {Shlomo Gelaki and Guillermo Sanmarco},
journal= {arXiv preprint arXiv:2403.08785},
year = {2025}
}