Geodesic
Categorical generalisations of quantum double models
Theory and applications of categories, Tome 41 (2024), pp. 1293-1351

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We show that every involutive Hopf monoid in a complete and finitely cocomplete symmetric monoidal category gives rise to invariants of oriented surfaces defined in terms of ribbon graphs. For every ribbon graph this yields an object in the category, defined up to isomorphism, that depends only on the homeomorphism class of the associated surface. This object is constructed via (co)equalisers and images and equipped with a mapping class group action. It can be viewed as a categorical generalisation of the ground state of Kitaev's quantum double model or of a representation variety for a surface. We apply the construction to group objects in cartesian monoidal categories, in particular to simplicial groups as group objects in SSet and to crossed modules as group objects in Cat. The former yields a simplicial set consisting of representation varieties, the latter a groupoid whose sets of objects and morphisms are obtained from representation varieties.

Publié le :
Classification : 57K20, 18G45, 16T05, 18C40, 18M05
Keywords: representation varieties, Hopf monoids in symmetric monoidal categories, group objects, crossed modules, quantum double models, mapping class group actions 
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     author = {Anna-Katharina Hirmer and Catherine Meusburger},
     title = {Categorical generalisations of quantum double models},
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     pages = {1293--1351},
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     volume = {41},
     year = {2024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2024_41_a36/}
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Anna-Katharina Hirmer; Catherine Meusburger. Categorical generalisations of quantum double models. Theory and applications of categories, Tome 41 (2024), pp. 1293-1351. http://geodesic.mathdoc.fr/item/TAC_2024_41_a36/