Twisted Leopoldt conjecture

Let FF be a number field, let pp be an odd prime, let SS be the set of pp-adic and infinite primes of FF, and let GS(F)G_S(F) be the Galois group of the maximal algebraic extension of FF unramified outside SS. For an integer i1i\neq 1, consider the Galois cohomology group H2(GS(F),Qp/Zp(i))H^2(G_S(F),\mathbb{Q}_p/\mathbb{Z}_p(i)). Twisted Leopoldt conjecture. For every number field FF and every integer i1i\neq 1,

H2(GS(F),Qp/Zp(i))=0.H^2(G_S(F),\mathbb{Q}_p/\mathbb{Z}_p(i))=0.

The paper notes that the case i=0i=0 is true for abelian extensions of Q\mathbb{Q} and that all cases i2i\geq2 are known by Soulé; the full assertion as stated is not resolved in general.

Sources & referencesView supporting material

Primary source

J. Assim and Z. Boughadi, “On Greenberg's generalized conjecture”, arXiv:2007.10936 (2021).

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