Finiteness conjecture for nontrivial logarithmic class groups

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Let kk be a fixed number field. Assume that kk satisfies the Leopoldt and Gross–Kuz'min conjectures for every prime. Let H~k(p)\widetilde{\mathcal H}_k(p) denote the logarithmic class group of kk at the prime pp.

Finiteness conjecture for logarithmic class groups. The set

{p:H~k(p)≠1}\{p: \widetilde{\mathcal H}_k(p)\ne 1\}

is finite.

This predicts that only finitely many primes yield a nontrivial logarithmic class group for a fixed field satisfying the stated universal conjectural hypotheses. The source gives no evidence of resolution.

References

Primary source

Georges Gras, “On the Z_p-extensions of a totally p-adic imaginary quadratic field – With an appendix by Jean-François Jaulent”, arXiv:2403.16603 (2026).

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