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Bridgeland Moduli spaces for Gushel-Mukai threefolds and Kuznetsov's Fano threefold conjecture

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arxiv 2012.12193 v2 pith:MCLM4SJX submitted 2020-12-22 math.AG

classification math.AG
keywords gushel-mukaikuznetsovthreefoldbridgelandcomponentfanomathcalmoduli
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abstract

We study the Hilbert scheme $\mathcal{H}$ of twisted cubics on a special smooth Gushel-Mukai threefolds $X_{10}$. We show that it is a smooth irreducible projective threefold if $X_{10}$ is general among special Gushel-Mukai threefolds, while it is singular if $X_{10}$ is not general. We construct an irreducible component of a moduli space of Bridgeland stable objects in the Kuznetsov component of $X_{10}$ as a divisorial contraction of $\mathcal{H}$. We also identify the minimal model of Fano surface $\mathcal{C}(X_{10}')$ of conics on a smooth ordinary Gushel-Mukai threefold with moduli space of Bridgeland stable objects in the Kuznetsov component of $X_{10}'$. As a result, we show that the Kuznetsov's Fano threefold conjecture is not true

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Cited by 2 Pith papers

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  1. On two families of Enriques categories over K3 surfaces

    math.AG 2024-12 unverdicted novelty 6.0 of 10

    The moduli spaces in two families of Enriques categories recover Beauville's involution, the double EPW sextic and cube, and a new birational involution on O'Grady's tenfold.

  2. Moduli spaces on the Kuznetsov component of Fano threefolds of index 2

    math.AG 2019-08 conditional novelty 6.0 of 10

    For general quartic double solids, two varieties are isomorphic if and only if their Kuznetsov components are equivalent, without assuming the equivalence has Fourier-Mumford type.

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