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arXiv 1609.04573math.AG
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作为稳定对象的模空间的三次四重体上的广义扭三次

Generalized twisted cubics on a cubic fourfold as a moduli space of stable objects

Martí Lahoz, Manfred Lehn, Emanuele Macrì, Paolo Stellari

摘要:

本文利用模空间重新讨论了Lehn-Lehn-Sorger-van Straten关于不含平面的三次四重空间中的扭三次曲线的工作。我们表明,爆破$Z'$沿立方的不可约全纯辛八重$Z$,所描述的四个作者,是同构的模空间的Gieseker稳定扭转层或秩三无挠的层的不可约组件。对于一个非常普遍的三次四倍,我们表明,$Z$是同构的一个连通组件的模空间的倾斜稳定的对象在导出范畴和一个模空间的Bridgeland稳定的对象在库兹涅佐夫组件。此外,$Z'$和$Z$之间的收缩实现为倾斜稳定性中的跨壁。最后,证明了$Z$对于秩为6的Gieseker稳定aCM丛的不可约分支是双有理的.

英文摘要:

We revisit the work of Lehn-Lehn-Sorger-van Straten on twisted cubic curves in a cubic fourfold not containing a plane in terms of moduli spaces. We show that the blow-up $Z'$ along the cubic of the irreducible holomorphic symplectic eightfold $Z$, described by the four authors, is isomorphic to an irreducible component of a moduli space of Gieseker stable torsion sheaves or rank three torsion free sheaves. For a very general such cubic fourfold, we show that $Z$ is isomorphic to a connected component of a moduli space of tilt-stable objects in the derived category and to a moduli space of Bridgeland stable objects in the Kuznetsov component. Moreover, the contraction between $Z'$ and $Z$ is realized as a wall-crossing in tilt-stability. Finally, $Z$ is birational to an irreducible component of Gieseker stable aCM bundles of rank six.

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