Abstract
We evaluate to one loop the functional integral that computes the partition functions of Chern-Simons theories based on compact groups, using the background field method and a covariant gauge fixing. We compare our computation with the results of other, less direct methods. We find that our method correctly computes the characters of irreducible representations of Kac-Moody algebras. To extend the computation to non-compact groups we need to perform an appropriate analytic continuation of the partition function of the compact group. Non-vacuum characters are found by inserting a Wilson loop in the functional integral. We then extend our method to Euclidean Anti-de Sitter pure gravity in three dimensions. The explicit computation unveils several interesting features and lessons. The most important among them is that the very definition of gravity in the first-order Chern-Simons formalism requires non-trivial analytic continuations of the gauge fields outside their original domains of definition.
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Porrati, M., Yu, C. Kac-Moody and Virasoro characters from the perturbative Chern-Simons path integral. J. High Energ. Phys. 2019, 83 (2019). https://doi.org/10.1007/JHEP05(2019)083
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DOI: https://doi.org/10.1007/JHEP05(2019)083