Sociology

Reciprocity (cultural anthropology)

Pure mathematics

Mathematics

Equivariant cohomology

Cohomology

Algebra over a field

Hodge theory

Projective test

Anthropology

Sheaf

De Rham cohomology

Motivic cohomology

Forum of Mathematics Sigma

In this paper, we show the existence of an action of Chow correspondences on the cohomology of reciprocity sheaves. In order to do so, we prove a number of structural results, such as a projective bundle formula, a blow-up formula, a Gysin sequence and the existence of proper pushforward. In this way, we recover and generalise analogous statements for the cohomology of Hodge sheaves and Hodge-Witt sheaves. We give several applications of the general theory to problems which have been classically studied. Among these applications, we construct new birational invariants of smooth projective varieties and obstructions to the existence of zero cycles of degree 1 from the cohomology of reciprocity sheaves.

On the cohomology of reciprocity sheaves