English

Nekovar duality over p-adic Lie extensions of global fields

Number Theory 2014-02-18 v2

Abstract

Poitou-Tate duality for the Galois group of an extension of a global field with appropriately restricted ramification can be seen as taking place between the cohomology of a compact or discrete module and the compactly-supported cohomology of its Pontryagin dual. Nekovar proved a derived variant of this in which the module is replaced by a bounded complex of modules over the group ring of R that are finitely generated over R, where R is a complete commutative local Noetherian ring with finite residue field. Here, the Pontryagin dual is replaced by the Grothendieck dual, which is itself a bounded complex of modules with finitely generated cohomology. Nekovar's duality then takes place in the derived category of R-modules. We extend Nekovar's result to the setting of noncommutative Iwasawa theory. That is, we exhibit a duality between complexes computing Iwasawa cohomology and its compactly supported variant in the derived category of finitely generated modules over the Iwasawa algebra over R of a p-adic Lie extension.

Keywords

Cite

@article{arxiv.1104.1230,
  title  = {Nekovar duality over p-adic Lie extensions of global fields},
  author = {Meng Fai Lim and Romyar T. Sharifi},
  journal= {arXiv preprint arXiv:1104.1230},
  year   = {2014}
}

Comments

62 pages

R2 v1 2026-06-21T17:50:36.542Z