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arXiv · 2606.31649

Tamagawa ratios and unbounded Selmer moments

Peter Koymans·Alexander Smith
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Abstract

We develop a framework to predict whether a family of Selmer groups has average size that is bounded or unbounded. Applying this framework to certain geometric families of abelian varieties over $\mathbb{Q}$, we give a conjectural characterization of which such families have $\ell$-Selmer groups of unbounded average size for a given prime $\ell$. In the case that the $\ell$-torsion Galois module is constant across the family, we show that our characterization is correct. The key tool of our technique is the Greenberg--Wiles' formula, which expresses the ratio of the sizes of a Selmer group and the corresponding dual Selmer group as a product of local factors. This formula gives a purely local lower bound for the size of a Selmer group that we conjecture is close to sharp most of the time.

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Peter Koymans, Alexander Smith. 2026-06-30. Tamagawa ratios and unbounded Selmer moments. https://arxiv.org/abs/2606.31649

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