Capitulation, unit groups, and the cohomology of $S$-id\`{e}le classes

Abstract

Let $L/K$ be a finite, cyclic extension of number fields with Galois group $G$, and let $S$ be a finite set of primes of $K$ that includes all the infinite primes. In this paper, we study the $G$-cohomology of the $S$-id\`{e}le classes of $L$ and relate it to the $S$-capitulation map as well as to the $G$-cohomology of the $S$-unit group $U_{L,S}$.