Non-abelian strong Coates-Sinnott conjecture for higher étale cohomology

Let K/kK/k be a Galois extension of number fields with Galois group GG, let pp be an odd prime, let n>1n>1, and let SS and TT be finite non-empty disjoint sets of places of kk, with SS containing the ramified and infinite places, no pp-adic place in TT, and with CST(Zp(n))C_S^T(\mathbb Z_p(n)) the complex defined in the paper. Non-abelian strong Coates-Sinnott conjecture. One has

θST(1n)FittZpGmax(H2(CST(Zp(n)))).\theta_S^T(1-n)\in\operatorname{Fitt}_{\mathbb Z_pG}^{\max}\left(H^2\left(C_S^T(\mathbb Z_p(n))\right)\right).

This is the higher analogue of the strong Brumer-Stark property. It is intended to yield a non-abelian analogue of the Coates-Sinnott conjecture; the paper notes that the corresponding strong property does not hold in general in degree zero, whereas the higher analogue is conjectured to behave better.

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Primary source

Andreas Nickel, “Equivariant Iwasawa theory and non-abelian Stark-type conjectures”, arXiv:1109.5525 (2012).

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