English

Moduli spaces of $\mathbb{Z}/k\mathbb{Z}$-constellations over $\mathbb{A}^2$

Algebraic Geometry 2024-05-15 v2 Commutative Algebra Combinatorics

Abstract

Let ρ:Z/kZSL(2,C)\rho:\mathbb{Z}/k \mathbb{Z}\rightarrow \text{SL}(2,\mathbb{C}) be a representation of a finite abelian group and let ΘgenHomZ(R(Z/kZ),Q)\Theta^{\text{gen}}\subset \text{Hom}_\mathbb{Z}(R(\mathbb{Z}/k\mathbb{Z}),\mathbb{Q}) be the space of generic stability conditions on the set of GG-constellations. We provide a combinatorial description of all the chambers CΘgenC\subset\Theta^{\text{gen}} and prove that there are k!k! of them. Moreover, we introduce the notion of simple chamber and we show that, in order to know all toric GG-constellations, it is enough to build all simple chambers. We also prove that there are k2k2k\cdot 2^{k-2} simple chambers. Finally, we provide an explicit formula for the tautological bundles RC\mathscr{R}_C over the moduli spaces MC\mathscr{M} _C for all chambers CΘgenC\subset \Theta^{\text{gen}} which only depends upon the chamber stair which is a combinatorial object attached to the chamber CC.

Keywords

Cite

@article{arxiv.2205.07492,
  title  = {Moduli spaces of $\mathbb{Z}/k\mathbb{Z}$-constellations over $\mathbb{A}^2$},
  author = {Michele Graffeo},
  journal= {arXiv preprint arXiv:2205.07492},
  year   = {2024}
}

Comments

44 pages, 21 figures

R2 v1 2026-06-24T11:18:11.266Z