Geometric stabilisation via $p$-adic integration

Geometric stabilisation via $p$-adic integration
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通过 $p$-adic 积分实现几何稳定

DOI:
10.1090/jams/948
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发表时间:
2018
影响因子:
3.9
通讯作者:
Paul Ziegler
Paul Ziegler
中科院分区:
数学1区
文献类型:
--
作者:
M. Groechenig;Dimitri Wyss;Paul Ziegler

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在本文中,我们给出了 Ng\^o 几何稳定定理的新证明,它隐含了基本引理。该陈述将准分裂还原群方案 $G$ 的希钦纤维上同调与内窥镜群 $H_{\kappa}$ 的希钦纤维上同调联系起来。我们的证明避免了分解和支持定理,而是基于 Deligne-Mumford 堆栈的粗模空间上的 $p$-adic 积分的结果。在此过程中,我们根据内窥镜数据建立了 $G$-希格斯丛的(各向异性)模量堆栈的惯性堆栈描述,并将朗兰兹对偶群方案的通用希钦纤维的对偶性扩展到准分裂情况。
In this article we give a new proof of Ng\^o's Geometric Stabilisation Theorem, which implies the Fundamental Lemma. This is a statement which relates the cohomology of Hitchin fibres for a quasi-split reductive group scheme $G$ to the cohomology of Hitchin fibres for the endoscopy groups $H_{\kappa}$. Our proof avoids the Decomposition and Support Theorem, instead the argument is based on results for $p$-adic integration on coarse moduli spaces of Deligne-Mumford stacks. Along the way we establish a description of the inertia stack of the (anisotropic) moduli stack of $G$-Higgs bundles in terms of endoscopic data, and extend duality for generic Hitchin fibres of Langlands dual group schemes to the quasi-split case.
DOI: 10.1112/plms.12387
发表时间: 2017-02
影响因子: 1.8
作者:
Kenneth Ascher;Dori Bejleri
通讯作者: Kenneth Ascher;Dori Bejleri