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arXiv 2210.03095math.AG
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Beauville-Mukai系统III的双有理几何:渐近行为

Birational geometry of Beauville-Mukai systems III: asymptotic behavior

Xuqiang Qin, Justin Sawon

摘要:

假设Picard秩为1的K3曲面S上的点的Hilbert概型存在有理拉格朗日纤维化。我们表明,如果表面的程度是足够大的点的数量相比,那么希尔伯特计划是唯一的超凯勒流形在其双有理类。特别地,希尔伯特方案本身是拉格朗日纤维化,我们认识到它来自S的Fourier-Mukai伙伴上的(扭曲的)Beauville-Mukai系统。我们还表明,当表面的程度是小的,我们的方法可以用来找到所有的双有理模型的希尔伯特计划。

英文摘要:

Suppose that a Hilbert scheme of points on a K3 surface S of Picard rank one admits a rational Lagrangian fibration. We show that if the degree of the surface is sufficiently large compared to the number of points, then the Hilbert scheme is the unique hyperkähler manifold in its birational class. In particular, the Hilbert scheme is a Lagrangian fibration itself, which we realize as coming from a (twisted) Beauville-Mukai system on a Fourier-Mukai partner of S. We also show that when the degree of the surface is small our method can be used to find all birational models of the Hilbert scheme.

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