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arXiv 2605.03097math.AG
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通用紧化雅可比簇的支持定理

Support theorem of universal compactified Jacobians

Columbia University(哥伦比亚大学)

Yifan Wu

AI总结:

本文证明了通用紧化雅可比簇的相对好模空间的全支持定理,并描述了由通用曲线上的常层导出前推控制的BBDG分解。

摘要:

我们证明了通用紧化雅可比簇的相对好模空间 $arπ\colon \overline{J}_{g,n}^{d,ϕ} o \overline{\mathcal{M}}_{g,n}$ 的全支持定理,表明 $\mathrm{R}arπ_*\mathrm{IC}(\overline{J}_{g,n}^{d,ϕ})$ 的BBDG分解中的每个直和项在基 $\overline{\mathcal{M}}_{g,n}$ 上具有全支持。此外,我们显式描述了由通用曲线上的常层导出前推控制的这个分解。第一个证明综合了Maulik和Shen对Ngô支持定理的推广、好模空间态射的分解定理以及等变反常层。我们还通过稳定性条件的变化和Migliorini、Shende、Viviani关于相对雅可比簇的支持定理提供了独立的第二个证明。

英文摘要:

We prove a full support theorem for the relative good moduli space of the universal compactified Jacobian $\barπ\colon \overline{J}_{g,n}^{d,ϕ}\to \overline{\mathcal{M}}_{g,n}$, showing that every direct summand appearing in the BBDG decomposition of $\mathrm{R}\barπ_*\mathrm{IC}(\overline{J}_{g,n}^{d,ϕ})$ has full support on the base $\overline{\mathcal{M}}_{g,n}$. Moreover, we explicitly describe this decomposition governed by the derived pushforward of the constant sheaf on the universal curve. The first proof synthesizes Maulik and Shen's generalization of Ngô's support theorem, a decomposition theorem for the good moduli space morphism, and equivariant perverse sheaves. We also provide an independent second proof by variation of stability conditions and the support theorem for relative Jacobians by Migliorini, Shende, and Viviani.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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