Pairings in Hopf-cyclic cohomology of algebras and coalgebras with coefficients

Details Pairings in Hopf-cyclic cohomology of algebras and coalgebras with coefficients Pairings in Hopf-cyclic cohomology of algebras and coalgebras with coefficients

2006-10-20

arxiv.org/abs/math/0610615v1

Mathematics

K-Theory and Homology

An revised and extended version of talk, given by the second author at the "Noncommutative Geometry and Cyclic Homology", Newt

Scientific paper

This paper is concerned with the theory of cup-products in Hopf-type cyclic cohomology of algebras and coalgebras. Here we give detailed proofs of the statements, announced in our previous paper. We show that the cyclic cohomology of a coalgebra can be obtained from a construction involving noncommutative Weil algebra. Then we use a generalization of Quillen and Crainic's construction to define the cup-product. We discuss the relation of the introduced cup-product and $S$-operations on cyclic cohomology. After this we describe the relation of this type of product and bivariant cyclic cohomology. In the last section we briefly discuss the relation of our constructions with that of Khalkhali and Rangipour.

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