Coefficients for higher order Hochschild cohomology

When studying deformations of an $A$-module $M$, Laudal and Yau showed that one can consider $1$-cocycles in the Hochschild cohomology of with coefficients in the bi-module $\mathit{End \,}_k(M)$.With this in mind, the use of higher order Hochschild (co)homology, presented by Pirashvili and Anderson, to study deformations seems only natural though the current definition allows only symmetric bi-module coefficients. In this paper we present an extended definition for higher order Hochschild cohomology which allows multi-module coefficients (when the simplicial sets $\mathbf{X}_{\bullet}$ are accommodating), which agrees with the current definition. Furthermore, we determine the types of modules that can be used as coefficients for the Hochschild cochain complexes based on the simplicial sets they are associated to.

Keywords

Hochschild, cohomology, higher order, simplicial, deformation, multi-module, coefficient

2010 Mathematics Subject Classification

Primary 13D03. Secondary 13D10, 16S80, 18G30, 55U10.

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Published 18 May 2015