Abstract:
The paper is a natural continuation and generalization of the works of Fesenko and of the authors.
Fesenko's theory is carried over to infinite APF-Galois extensions L over a local field K with a finite residue-class field κK of q=pf elements, satisfying μp(Ksep)⊂K and K⊂L⊂Kφd, where the residue-class degree [κL:κK] is equal to d. More precisely, for such extensions L/K and a fixed Lubin–Tate splitting φ over K, a 1-cocycle
Φ(φ)L/K:Gal(L/K)→K×/NL0/KL×0×U⋄˜X(L/K)/YL/L0
where L0=L∩Knr, is constructed, and its functorial and ramification-theoretic
properties are studied. The case of d=1 recovers the theory of Fesenko.
Keywords:
local fields, higher-ramification theory, APF-extensions Fontaine–Wintenberger field of norms, Fesenko reciprocity map, generalized Fesenko reciprocity map, non-abelian local class field theory.
Citation:
K. I. Ikeda, E. Serbest, “Generalized Fesenko reciprocity map”, Algebra i Analiz, 20:4 (2008), 118–159; St. Petersburg Math. J., 20:4 (2009), 593–624