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arXiv · 1409.7564

Variation of Gieseker moduli spaces via quiver GIT

Daniel Greb·Julius Ross·Matei Toma
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Abstract

We introduce a notion of stability for sheaves with respect to several polarisations that generalises the usual notion of Gieseker-stability. We prove, under a boundedness assumption, which we show to hold on threefolds or for rank two sheaves on base manifolds of arbitrary dimension, that semistable sheaves have a projective coarse moduli space that depends on a natural stability parameter. We then give two applications of this machinery. First, we show that given a real ample class $ω\in N^1(X)_\mathbb{R}$ on a smooth projective threefold $X$ there exists a projective moduli space of sheaves that are Gieseker-semistable with respect to $ω$. Second, we prove that given any two ample line bundles on $X$ the corresponding Gieseker moduli spaces are related by Thaddeus-flips.

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BibTeXRIS

Daniel Greb, Julius Ross, Matei Toma. 2015-08-17. Variation of Gieseker moduli spaces via quiver GIT. https://doi.org/10.2140/gt.2016.20.1539

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