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Higher Hochschild homology as a functor

Presented by: 
Christine Vespa University of Strasbourg
Date: 
Wednesday 5th December 2018 - 10:00 to 11:00
Venue: 
INI Seminar Room 1
Abstract: 
Higher Hochschild homology generalizes classical Hochschild homology for rings. Recently, Turchin and Willwacher computed higher Hochschild homology of a finite wedge of circles with coefficients in the Loday functor associated to the ring of dual numbers over the rationals. In particular, they obtained linear representations of the groups Out(F_n) which do not factorize through GL(n,Z). <br> <br> In this talk I will explain how viewing higher Hochschild homology of a finite wedge of circles as a functor on the category of free groups provides a conceptual framework which allows powerful tools such as exponential functors and polynomial functors to be brought to bear. In particular, this allows the generalization of the results of Turchin and Willwacher; this gives rise to new linear representations of Out(F_n) which do not factorize through GL(n,Z). <br> <br> (This is joint work with Geoffrey Powell.)<br> <br>
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