Saturday, 6 December 2008

kt.k theory homology - Regarding the Gerstenhaber bracket on Hochschild cohomology and Morita equivalence

Associated to any Ainfty k-algebra A the Hochschild cochain complex CH(A) has the structure of a dg-Lie algebra and a dg-algebra which are compatible enough that the cohomology is a Gerstenhaber algebra.



If two Ainfty algebras are Morita equivalent, are their Hochschild cochain complexes isomorphic in (i) the category of k-dg-algebras and (ii) the category of k-dg-Lie algebras, both up to quasi-isomorphism? Are they isomorphic in some category that feels both structures together?



Now suppose that mathcalC is a dg-category over a field k. We say that the k-dg-algebra CH(mathcalC)=End(idmathcalC) is the Hochschild cochain complex. Does CH(mathcalC) have a bracket that generalizes the known one in the case that mathcalC is a (derived) category of modules? If two dg-categories are quasi-equivalent are their Hochschild cochain complexes quasi-isomorphic?



Is there a point of view that clarifies these issues?

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