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arXiv 0905.1803math.AG
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亏格为9的Fano三重上具有奇行列式的秩2稳定层

Rank 2 stable sheaves with odd determinant on Fano threefolds of genus 9

Maria Chiara Brambilla, Daniele Faenzi

摘要:

根据Mukai和Iliev的描述,亏格为9的光滑素Fano三重X与光滑平面四次Gamma上的曲面P(V)相关联。利用Kuznetsov积分函子研究了X上具有奇行列式的秩2稳定层.对于每个c_2 \geq 7,我们证明了它们的模空间M_X(2,1,c_2)的一个分支对于Gamma上具有足够截面的丛的Brill-Noether轨迹是双有理的.此外,我们还证明了M_X(2,1,7)同构于Picard簇Pic ^2(Gamma)沿X中包含的曲线参数化线的爆破.

英文摘要:

By the description due to Mukai and Iliev, a smooth prime Fano threefold X of genus 9 is associated to a surface P(V), ruled over a smooth plane quartic Gamma. We use Kuznetsov's integral functor to study rank-2 stable sheaves on X with odd determinant. For each c_2 \geq 7, we prove that a component of their moduli space M_X(2,1,c_2) is birational to a Brill-Noether locus of bundles on Gamma having enough sections when twisted by V. Moreover we prove that M_X(2,1,7) is isomorphic to the blowing-up of the Picard variety Pic^2(Gamma) along the curve parametrizing lines contained in X.

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