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Browsing by Author "Sharma, Amit"

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    Higher Picard groupoids and Dijkgraaf-Witten theory
    (2016-08) Sharma, Amit
    In the first part of this thesis we propose a model for additive $\infty$-categories based on $\gSs$ and construct the archetype example of an additive $\infty$-category, namely the (quasi)-category of higher Picard groupoids, $\pic$. The goal of the second part of this thesis is to categorify Dijkgraaf-Witten (DW) theory, aiming at providing foundation for a direct construction of DW theory as an Extended Topological Quantum Field Theory. The main tool is cohomology with coefficients in a Picard groupoid, namely the Picard groupoid of hermitian lines.