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Sur la dimension cohomologique des pro- p -extensions des corps de nombres

Christian Maire (2005)

Journal de Théorie des Nombres de Bordeaux

In this paper, we study the cohomological dimension of groups G S : = Gal ( 𝕂 S / 𝕂 ) , where 𝕂 S is the maximal pro- p -extension of a number field 𝕂 , unramified outside a finite set S of places of 𝕂 . This dimension is well-understood only when S contains all places above p ; in the case where only some of the places above p are contained in S , one can still obtain some results if 𝕂 S / 𝕂 contains at least one ℤ p -extension 𝕂 ∞ / 𝕂 . Indeed, in that case, the study of the ℤ p [ [ Gal ( 𝕂 ∞ / 𝕂 ) ] ] -module Gal ( 𝕂 S / 𝕂 ∞ ) a b allows one to give sufficient conditions for the pro- p -group...

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