Weight decomposition of de Rham cohomology sheaves and tropical cycle classes for non-Archimedean spaces

Abstract

We construct a functorial decomposition of de Rham cohomology sheaves, called weight decomposition, for smooth analytic spaces over non-Archimedean fields embeddable into $\mathbf{C}_p$, which generalizes a construction of Berkovich and solves a question raised by him. We then investigate complexes of real tropical differential forms and currents introduced by Chambert-Loir and Ducros, by establishing a relation with the weight decomposition and defining tropical cycle maps with values in the corresponding Dolbeault cohomology. As an application, we show that algebraic cycles that are cohomologically trivial in the algebraic de Rham cohomology are cohomologically trivial in the Dolbeault cohomology of currents as well.