On Iwasawa theory, zeta elements for 𝔾m, and the equivariant Tamagawa number conjecture

We develop an explicit “higher-rank” Iwasawa theory for zeta elements associated to the multiplicative group over abelian extensions of number fields. We show this theory leads to a concrete new strategy for proving special cases of the equivariant Tamagawa number conjecture and, as a first application of this approach, we prove new cases of the conjecture over natural families of abelian CM-extensions of totally real fields for which the relevant [math] -adic [math] -functions possess trivial zeroes.