Nekovár duality over p-adic Lie extensions of global fields
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Abstract
Tate duality is a Pontryagin duality between the i th Galois cohomology group of the absolute Galois group of a local field with coefficents in a finite module and the (2-i) th cohomology group of the Tate twist of the Pontryagin dual of the module. Poitou-Tate duality has a similar formulation, but the duality now takes place between Galois cohomology groups of a global field with restricted ramification and compactly-supported cohomology groups. Nekovár proved analogues of these in which the module in question is a finitely generated module T over a complete commutative local Noetherian ring R with a commuting Galois action, or a bounded complex thereof, and the Pontryagin dual is replaced with the Grothendieck dual T^* , which is a bounded complex of the same form. The cochain complexes computing the Galois cohomology groups of T and T^*(1) are then Grothendieck dual to each other in the derived category of finitely generated R -modules. Given a p -adic Lie extension of the ground field, we extend these to dualities between Galois cochain complexes of induced modules of T and T^*(1) in the derived category of finitely generated modules over the possibly noncommutative Iwasawa algebra with R -coefficients.
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