Invariant Cyclic Homology

Details Invariant Cyclic Homology Invariant Cyclic Homology

2002-07-14

arxiv.org/abs/math/0207118v2

Mathematics

K-Theory and Homology

Minor typos corrected. Final version to appear in K-theory

Scientific paper

We define a noncommutative analogue of invariant de Rham cohomology. More precisely, for a triple $(A,\mathcal{H},M)$ consisting of a Hopf algebra $\mathcal{H}$, an $\mathcal{H}$-comodule algebra $A$, an $\mathcal{H}$-module $M$, and a compatible grouplike element $\sigma$ in $\mathcal{H}$, we define the cyclic module of invariant chains on $A$ with coefficients in $M$ and call its cyclic homology the invariant cyclic homology of $A$ with coefficients in $M$. We also develop a dual theory for coalgebras. Examples include cyclic cohomology of Hopf algebras defined by Connes-Moscovici and its dual theory. We establish various results and computations including one for the quantum group $SL(q,2)$.

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