English

On Chow rings of quiver moduli

Algebraic Geometry 2023-08-22 v2 Representation Theory

Abstract

We describe the point class and Todd class in the Chow ring of a quiver moduli space, building on a result of Ellingsrud-Str{\o}mme. This, together with the presentation of the Chow ring by the second author, makes it possible to compute integrals on quiver moduli. To do so we construct a canonical morphism of universal representations in great generality, and along the way point out its relation to the Kodaira-Spencer morphism. We illustrate the results by computing some invariants of some "small" Kronecker moduli spaces. We also prove that the first non-trivial (6-dimensional) Kronecker quiver moduli space is isomorphic to the zero locus of a general section of Q(1)\mathcal{Q}^\vee(1) on Gr(2,8)\operatorname{Gr}(2,8).

Keywords

Cite

@article{arxiv.2307.01711,
  title  = {On Chow rings of quiver moduli},
  author = {Pieter Belmans and Hans Franzen},
  journal= {arXiv preprint arXiv:2307.01711},
  year   = {2023}
}

Comments

18 pages, now proves the conjecture from v1 and includes data on more Kronecker moduli