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arXiv · 1812.00446

Projective representations of mapping class groups in combinatorial quantization

Matthieu Faitg
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Abstract

Let $Σ_{g,n}$ be a compact oriented surface of genus $g$ with $n$ open disks removed. The graph algebra $\mathcal{L}_{g,n}(H)$ was introduced by Alekseev--Grosse--Schomerus and Buffenoir--Roche and is a combinatorial quantization of the moduli space of flat connections on $Σ_{g,n}$. We construct a projective representation of the mapping class group of $Σ_{g,n}$ using $\mathcal{L}_{g,n}(H)$ and its subalgebra of invariant elements. Here we assume that the gauge Hopf algebra $H$ is finite-dimensional, factorizable and ribbon, but not necessarily semi-simple. We also give explicit formulas for the representation of the Dehn twists generating the mapping class group; in particular, we show that it is equivalent to a representation constructed by V. Lyubashenko using categorical methods.

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Matthieu Faitg. 2018-12-19. Projective representations of mapping class groups in combinatorial quantization. https://doi.org/10.1007/s00220-019-03470-z

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