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arXiv 1601.02589math.AG
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希钦纤维化的一个支撑定理:$SL_n$情形

A support theorem for the Hitchin fibration: the case of $SL_n$

Mark Andrea A. de Cataldo

摘要:

我们证明了$D$ -扭曲$SL_n$希钦纤维化的直接镜像复形是由它对椭圆轨迹的限制决定的,其中谱曲线是积分的。对于$GL_n$的类似结果是由于P. - H. Chaudouard和G.劳蒙在此过程中,我们证明了相对Prym群格式的Tate模是可极化的,并且证明了某些辅助弱交换纤维化的$δ$ -正则性结果.

英文摘要:

We prove that the direct image complex for the $D$-twisted $SL_n$ Hitchin fibration is determined by its restriction to the elliptic locus, where the spectral curves are integral. The analogous result for $GL_n$ is due to P.-H. Chaudouard and G. Laumon. Along the way, we prove that the Tate module of the relative Prym group scheme is polarizable, and we also prove $δ$-regularity results for some auxiliary weak abelian fibrations.

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