De Rham logarithmic classes and Tate conjecture

Abstract

We introduce the definition of De Rham logarithmic classes. We show that the De Rham class of an algebraic cycle of a smooth algebraic variety over a field of characteristic zero is logarithmic and conversely that a logarithmic class of bidegree $(d,d)$ is the De Rham class of an algebraic cycle (of codimension $d$). We also give for smooth algebraic varieties over a $p$-adic field an analytic version of this result. We deduce from the analytic case the Tate conjecture for smooth projective varieties over fields of finite type over $\mathbb Q$.