The Gersten conjecture for p-adic tame Tate twists

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

0RnϵTrt(m)xX(0)i,xHq(k(x),Trt(m))xX(1)i,xHq1(k(x),Trt(m1))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 xX(d)i,xHqd(x,Trt(md))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 nmn\leq m by the Beilinson–Lichtenbaum conjecture and a cited theorem; the general case remains open.

Sources & referencesView supporting material

Primary source

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

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