English

Moduli spaces of one dimensional sheaves on log surfaces and Hilbert schemes

Algebraic Geometry 2025-05-02 v1

Abstract

Let XX be a smooth projective rational surface, DXD\subset X an effective anticanonical curve, β\beta a curve class on XX and d=wiPi\mathfrak{d}=\sum w_iP_i an effective divisor on DsmD_{\mathrm{sm}}. We consider the moduli space Mβ(X,D,d)\mathcal{M}_\beta(X, D, \mathfrak{d}) of sheaves on XX which are direct images of rank-11 torsion-free sheaves on integral curves CC in β\beta such that CD=dC|_D=\mathfrak{d}, and show that each point of Mβ(X,D,d)\mathcal{M}_\beta(X, D, \mathfrak{d}) is smooth over a point in the product of the Hilbert schemes of surface singularities of types Awi1A_{w_i-1}. Hence, Mβ(X,D,d)\mathcal{M}_\beta(X, D, \mathfrak{d}) has symplectic singularities and admits a unique symplectic resolution.

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Cite

@article{arxiv.2505.00246,
  title  = {Moduli spaces of one dimensional sheaves on log surfaces and Hilbert schemes},
  author = {Nobuyoshi Takahashi},
  journal= {arXiv preprint arXiv:2505.00246},
  year   = {2025}
}

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19 pages