An $l$-adic norm residue epimorphism theorem

Abstract

We show that the continuous \'etale cohomology groups $H^n_{\mathrm{cont}}(X,\mathbf{Q}_l(n))$ of smooth varieties $X$ over a finite field $k$ are spanned as $\mathbf{Q}_l$-vector spaces by the $n$-th Milnor $K$-sheaf locally for the Zariski topology, for all $n\ge 0$. Here $l$ is a prime invertible in $k$. This is the first general unconditional result towards the conjectures of arXiv:math/9801017 (math.AG) which put together the Tate and the Beilinson conjectures relative to algebraic cycles on smooth projective $k$-varieties.