English

Cohomology of non-generic character stacks

Algebraic Geometry 2024-10-31 v4 Representation Theory

Abstract

We study (compactly supported) cohomology of character stacks of punctured Riemann surfaces with prescribed semisimple local monodromies at punctures. In the case of generic local monodromies, the cohomology of these character stacks has already been studied by Hausel, Letellier and Rodriguez-Villegas and by Mellit. In this paper, we extend the results of Hausel, Letellier and Rodriguez-Villegas to the non-generic case. In particular, we compute the E-series and we give a conjectural formula for the mixed Poincar\'e series. Moreover, we verify our conjecture in the case of the projective line with 4 punctures and a certain choice of a non-generic quadruple.

Keywords

Cite

@article{arxiv.2310.01306,
  title  = {Cohomology of non-generic character stacks},
  author = {Tommaso Scognamiglio},
  journal= {arXiv preprint arXiv:2310.01306},
  year   = {2024}
}

Comments

Corrected typos and mistakes in the exposition+added some infos about multiplicative quiver stacks. All comments are welcome!