English

The Shafarevich conjecture for hypersurfaces in abelian varieties

Number Theory 2025-10-17 v5

Abstract

Faltings proved that there are finitely many abelian varieties of genus gg over a number field KK, with good reduction outside a finite set of primes SS. Fixing one of these abelian varieties AA, we prove that there are finitely many smooth hypersurfaces in AA, with good reduction outside SS, representing a given ample class in the N\'eron-Severi group of AA, up to translation, as long as the dimension of AA is at least 44. Our approach builds on the approach of arXiv:1807.02721 which studies pp-adic variations of Hodge structure to turn finiteness results for pp-adic Galois representations into geometric finiteness statements. A key new ingredient is an approach to proving big monodromy for the variations of Hodge structure arising from the middle cohomology of these hypersurfaces using the Tannakian theory of sheaf convolution on abelian varieties.

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Cite

@article{arxiv.2004.09046,
  title  = {The Shafarevich conjecture for hypersurfaces in abelian varieties},
  author = {Brian Lawrence and Will Sawin},
  journal= {arXiv preprint arXiv:2004.09046},
  year   = {2025}
}

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121 pages