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Some remarks on Fano threefolds of index two and stability conditions

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arxiv 2004.02798 v3 pith:7A365DI3 submitted 2020-04-06 math.AG

classification math.AG
keywords stabilityconditionsmathsfcomponentfanoindexlinesobjects
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abstract

We prove that ideal sheaves of lines in a Fano threefold $X$ of Picard rank one and index two are stable objects in the Kuznetsov component $\mathsf{Ku}(X)$, with respect to the stability conditions constructed by Bayer, Lahoz, Macr\`i and Stellari, giving a modular description to the Hilbert scheme of lines in $X$. When $X$ is a cubic threefold, we show that the Serre functor of $\mathsf{Ku}(X)$ preserves these stability conditions. As an application, we obtain the smoothness of non-empty moduli spaces of stable objects in $\mathsf{Ku}(X)$. When $X$ is a quartic double solid, we describe a connected component of the stability manifold parametrizing stability conditions on $\mathsf{Ku}(X)$.

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  1. 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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