English

Generalized Fesenko reciprocity map

Number Theory 2016-09-08 v1

Abstract

In this paper, which is the natural continuation and generalization of Fesenko's non-abelian reciprocity map, we extend the theory of Fesenko to infinite APFAPF-Galois extensions LL over a local field KK, with finite residue-class field κK\kappa_K of q=pfq=p^f elements, satisfying μp(Ksep)K\pmb{\mu}_p(K^{sep})\subset K and KLKϕdK\subset L\subset K_{\phi^d} where the residue-class degree [κL:κK]=d[\kappa_L:\kappa_K]=d. More precisely, for such extensions L/KL/K, fixing a Lubin-Tate splitting ϕ\phi over KK, we construct a 1-cocycle, \pmb{\Phi}_{L/K}^{(\phi)}:\text{Gal}(L/K)\to K^\times/N_{L_0/K}L_0^\times\times U_{\widetilde{\mathbb X}(L/K)}^\diamond /Y_{L/L_0}, where L0=LKnrL_0=L\cap K^{nr}, and study its functorial and ramification-theoretic properties. The case d=1d=1 recovers the theory of Fesenko.

Keywords

Cite

@article{arxiv.0805.3431,
  title  = {Generalized Fesenko reciprocity map},
  author = {Kâzim İlhan Ikeda and Erol Serbest},
  journal= {arXiv preprint arXiv:0805.3431},
  year   = {2016}
}

Comments

36 pages. To appear in Algebra i Analiz

R2 v1 2026-06-21T10:43:10.441Z