Module categories over affine supergroup schemes
Abstract
Let be an algebraically closed field of characteristic or . Let be an affine supergroup scheme over . We classify the indecomposable exact module categories over the tensor category of (coherent sheaves of) finite dimensional -supermodules in terms of -equivariant coherent sheaves on . We deduce from it the classification of indecomposable {\em geometrical} module categories over . When is finite, this yields the classification of {\em all} indecomposable exact module categories over the finite tensor category . In particular, we obtain a classification of twists for the supergroup algebra of a finite supergroup scheme , and then combine it with \cite[Corollary 4.1]{EG3} to classify finite dimensional triangular Hopf algebras with the Chevalley property over .
Cite
@article{arxiv.1909.10908,
title = {Module categories over affine supergroup schemes},
author = {Shlomo Gelaki},
journal= {arXiv preprint arXiv:1909.10908},
year = {2021}
}
Comments
24 pages, added Lemma 5.4, to appear in JPAA. arXiv admin note: text overlap with arXiv:1209.1155