On the values of Artin $L$-series at $s=1$ and annihilation of class groups

Volume 160 / 2013

Hugo Castillo, Andrew Jones Acta Arithmetica 160 (2013), 67-93 MSC: 11G40. DOI: 10.4064/aa160-1-5


Let $L$ be a finite Galois CM-extension of a totally real field $K$. We show that the validity of an appropriate special case of the Equivariant Tamagawa Number Conjecture leads to a natural construction for each odd prime $p$ of explicit elements in the (non-commutative) Fitting invariants over $\mathbb {Z}_p[G]$ of a certain tame ray class group, and hence also in the analogous Fitting invariants of the $p$-primary part of the ideal class group of $L$. These elements involve the values at $s=1$ of the Artin $L$-series of characters of the group ${\rm Gal}(L/K)$. We also show that our results become unconditional under certain natural hypotheses on the extension $L/K$ and prime $p$.


  • Hugo CastilloDepartment of Mathematics
    King's College London
    Strand WC2R 2LS, United Kingdom
  • Andrew Jones1 Sheridan Grove
    Milton Keynes MK4 4GP, United Kingdom

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