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arXiv 1706.01142math.AGmath.DSmath.GT
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差异层的Affine geometry

Affine geometry of strata of differentials

Dawei Chen

摘要:

在所有代数簇中,仿射簇具有简单的结构。例如,仿射簇不包含任何完整的代数曲线。本文研究了平滑曲线上的$k$ -微分层的仿射相关性质,光滑曲线是具有规定的零点和极点阶数的正则线丛的$k$次幂的参数化截面。我们证明了,如果有一个指定的极点的顺序至少$k$,那么相应的地层不包含任何完整的曲线。此外,我们还探讨了由Teichmüller动力学产生的仿射不变流形是否是仿射簇这一有趣的问题,并对Teichmüller曲线、环面覆盖的Hurwitz空间、超椭圆层以及某些低亏格层给出了答案.

英文摘要:

Affine varieties among all algebraic varieties have simple structures. For example, an affine variety does not contain any complete algebraic curve. In this paper we study affine related properties of strata of $k$-differentials on smooth curves which parameterize sections of the $k$-th power of the canonical line bundle with prescribed orders of zeros and poles. We show that if there is a prescribed pole of order at least $k$, then the corresponding stratum does not contain any complete curve. Moreover, we explore the amusing question whether affine invariant manifolds arising from Teichmüller dynamics are affine varieties, and confirm the answer for Teichmüller curves, Hurwitz spaces of torus coverings, hyperelliptic strata as well as some low genus strata.

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