The Gersten conjecture for p-adic tame Tate twists

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Let XX be a smooth scheme over SS of dimension dd. Write X(a)X^{(a)} for the points of codimension aa, i∗,xi_{*,x} for extension by zero from xx, ϵ\epsilon for the relevant morphism of sites, and Trt(m)\mathcal T_r^t(m) for the pp-adic tame Tate twist. Gersten conjecture. The complex of sheaves

0→Rnϵ∗Trt(m)→⨁x∈X(0)i∗,xHq(k(x),Trt(m))→⨁x∈X(1)i∗,xHq−1(k(x),Trt(m−1))→0\to R^n\epsilon_*\mathcal T_r^t(m)\to\bigoplus_{x\in X^{(0)}}i_{*,x}H^q(k(x),\mathcal T_r^t(m))\to\bigoplus_{x\in X^{(1)}}i_{*,x}H^{q-1}(k(x),\mathcal T_r^t(m-1))\to ⋯→⨁x∈X(d)i∗,xHq−d(x,Trt(m−d))→0\cdots\to\bigoplus_{x\in X^{(d)}}i_{*,x}H^{q-d}(x,\mathcal T_r^t(m-d))\to0

is exact in the Nisnevich topology.

This is the Gersten conjecture for pp-adic tame Tate twists. The source says it is known for pp-adic etale Tate twists and that the displayed conjecture holds for n≤mn\leq m by the Beilinson–Lichtenbaum conjecture and a cited theorem; the general case remains open.

References

Primary source

Morten Lüders, “p-adic tame Tate twists”, arXiv:2407.07979 (2024).

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