Volume and symplectic structure for ℓ-adic local systems
Volume and symplectic structure for ℓ-adic local systems
复制标题
α-adic 局部系统的体积和辛结构
DOI:
10.1016/j.aim.2021.107836
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发表时间:
2021
影响因子:
1.7
通讯作者:
Pappas, Georgios
中科院分区:
文献类型:
--
作者:
Pappas, Georgios
We introduce a notion of volume for anℓ-adic local system over an algebraic curve and, under some conditions, give a symplectic form on the rigid analytic deformation space of the corresponding geometric local system. These constructions can be viewed as arithmetic analogues of the volume and the Chern-Simons invariants of a representation of the fundamental group of a 3-manifold which fibers over the circle and of the symplectic form on the character varieties of a Riemann surface. We show that the absolute Galois group acts on the deformation space by conformal symplectomorphisms which extend to anℓ-adic analytic flow. We also prove that the locus of local systems which are arithmetic over a cyclotomic extension is the critical set of a collection of rigid analytic functions. The vanishing cycles of these functions give additional invariants.
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DOI:
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2001
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影响因子:
--
作者:
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通讯作者:
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影响因子:
3.7
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期刊:
Astérisque
影响因子:
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