The Chern character of the Verlinde bundle over ℳ¯ g,n

We prove an explicit formula for the total Chern character of the Verlinde bundle of conformal blocks over in terms of tautological classes. The Chern characters of the Verlinde bundles define a semisimple CohFT (the ranks, given by the Verlinde formula, determine a semisimple fusion algebra). Accor...

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Published inJournal für die reine und angewandte Mathematik Vol. 2017; no. 732; pp. 147 - 163
Main Authors Marian, Alina, Oprea, Dragos, Pandharipande, Rahul, Pixton, Aaron, Zvonkine, Dimitri
Format Journal Article
LanguageEnglish
Published De Gruyter 01.11.2017
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Summary:We prove an explicit formula for the total Chern character of the Verlinde bundle of conformal blocks over in terms of tautological classes. The Chern characters of the Verlinde bundles define a semisimple CohFT (the ranks, given by the Verlinde formula, determine a semisimple fusion algebra). According to Teleman’s classification of semisimple CohFTs, there exists an element of Givental’s group transforming the fusion algebra into the CohFT. We determine the element using the first Chern class of the Verlinde bundle on the interior and the projective flatness of the Hitchin connection.
ISSN:0075-4102
1435-5345
DOI:10.1515/crelle-2015-0003