Kummer-faithfulness conjecture for finite extensions of random fixed fields

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Let KK be a finitely generated field over Q\mathbb{Q} and let ee be a positive integer. For almostallalmost all σ∈GKe\sigma\in G_K^e, every finite extension of K‾(σ)\overline{K}(\sigma) is Kummer-faithful, meaning that for every abelian variety AA over the field, the divisible subgroup A(L)divA(L)_\mathrm{div} is trivial.

Kummer-faithfulness conjecture. Any finite extension of K‾(σ)\overline{K}(\sigma) is Kummer-faithful for almost all σ∈GKe\sigma\in G_K^e.

This conjecture would provide examples of Kummer-faithful fields that need not be sub-pp-adic. It builds on known results showing that, under the same finite-generation and e≥2e\geq 2 hypotheses, such finite extensions are AVKF for almost all σ\sigma, while Kummer-faithfulness has been studied in related work; its general assertion remains open.

References

Primary source

Takuya Asayama, “Kummer-faithful fields with finitely generated absolute Galois group”, arXiv:2601.10298 (2026).

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