Principalisation abélienne des groupes de classes logarithmiques

Abstract

We extend to logarithmic class groups the results on abelian principalization of tame ray class groups of a number field obtained in a previous article. As a consequence, for any extension $K/k$ of number fields which satisfies the Gross-Kuz'min conjecture for the prime $\ell$ and where at least one of the infinite places completely splits, we prove that there exists infinitely many abelian $\ell$-extensions $F/k$ such that the relative subgroup $\mathcal{C}\ell_{K/k} = \Ker (\mathcal{C}\ell_K\to\mathcal{C}\ell_\k)$ of the $\ell$-group of logarithmic classes of $K$ capitulates in the compositum $FK$.