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The section conjecture for the toric fundamental group over p-adic fields

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arxiv 2409.07923 v4 pith:5D24OYIY submitted 2024-09-12 math.AG math.NT

The section conjecture for the toric fundamental group over p-adic fields

classification math.AG math.NT
keywords toricconjecturefundamentalgroupsectionadicetalefields
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The toric fundamental group is the Tannaka dual of a category of vector bundles which become direct sums of line bundles on a finite \'etale cover. It is an extension of the \'etale fundamental group scheme by a projective limit of tori. Grothendieck's section conjecture for the \'etale fundamental group implies the analogous statement for the toric fundamental group. We call this the toric section conjecture. We prove that a resolution of the toric section conjecture would reduce the original one to particular cases about which more is known, mainly due to J. Stix. We prove that abelian varieties over $p$-adic fields satisfy the toric section conjecture, and give strong evidence that it holds for hyperbolic curves over $p$-adic fields, too.

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    Neutral faithful representations of finite groups are fully classified in dimension ≤3, with a general neutrality criterion for abelian groups and a normalizer theory for gerbe morphisms that depends only on geometric type.