Pj. Morandi et Ba. Sethuraman, Generalized cocycles with values in one-units of Henselian valued divisionalgebras, J ALGEBRA, 224(1), 2000, pp. 123-139
Let Z/F be an inertial Galois extension of Henselian valued fields, and let
D be a Z-central division algebra. Let G be a finite group acting on 2 wit
h fixed field F. We show that every generalized cocycle of G with values in
the one-units of D is cohomologous to one of the form (theta, 1), or in ot
her words, the existence of such a cocycle implies that the group action of
G on Z extends to a group action on D. We provide applications to lifting
of group actions on the residue division algebra and to the existence of Ku
mmer subfields in D given suitable data in (D) over bar. (C) 2000 Academic
Press.