Hopf algebras, tetramodules, and n-fold monoidal categories

Details Hopf algebras, tetramodules, and n-fold monoidal categories Hopf algebras, tetramodules, and n-fold monoidal categories

2009-07-20

arxiv.org/abs/0907.3335v2

Mathematics

Category Theory

51 page, v2: sections 3.5 and 4.4 are much improved, proof of Key-lemma 3.9 is completed, some typos are corrected

Scientific paper

The abelian category of tetramodules over an associative bialgebra $A$ is related with the Gerstenhaber-Schack (GS) cohomology as $Ext_\Tetra(A,A)=H_\GS(A)$. We construct a 2-fold monoidal structure on the category of tetramodules of a bialgebra. Suppose $C$ is an abelian $n$-fold monoidal category with the unit object $A$. We prove, provided some condition (*), that $Ext_C(A,A)$ is an $(n+1)$-algebra. In the case of bialgebras this condition (*) is satisfied when $A$ is a Hopf algebra. Finally, the GS cohomology of a Hopf algebra is a 3-algebra. As well, we consider this kind of questions of (bi)algebras over integers. Let $A$ be an associative algebra over $Z$ flat over $Z$. We prove that the operad acting on its Hochschild cohomology is the operad of stable homotopy groups of the little discs operad.

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