Geometria Complessa e Geometria Differenziale
Geometria Complessa e Geometria Differenziale
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Central extensions of mapping class groups from characteristic classes

Alessandro Valentino

created by risa on 15 May 2015

20 may 2015 -- 14:30

Aula di Consiglio, Dip. Matematica, Università "La Sapienza", Roma

Abstract.

I will discuss a functorial construction of extensions of mapping class groups of smooth manifolds which are induced by extensions of (higher) diffeomorphisms groups via the group stack of automorphisms of manifolds equipped with higher degree topological structures. The problem of constructing such extensions arises naturally in the study of topological quantum field theories, in particular in 3d Chern-Simons theory. Joint work with Domenico Fiorenza and Urs Schreiber.

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