Abstract
3-dimensional BF theory with gauge group G (= Chern-Simons theory with non-compact gauge group TG) is a deceptively simple yet subtle topological gauge theory. Formally, its partition function is a sum/integral over the moduli space \( \mathcal{M} \) of flat connections, weighted by the Ray-Singer torsion. In practice, however, this formal expression is almost invariably singular and ill-defined.
In order to improve upon this, we perform a direct evaluation of the path integral for certain classes of 3-manifolds (namely integral and rational Seifert homology spheres). By a suitable choice of gauge, we sidestep the issue of having to integrate over \( \mathcal{M} \) and reduce the partition function to a finite-dimensional Abelian matrix integral which, however, itself requires a definition. We offer 3 definitions of this integral, firstly via residues, and then via a large k limit of the corresponding G × G or Gℂ Chern-Simons matrix integrals (obtained previously). We then check and discuss to which extent the results capture the expected sum/integral over all flat connections.
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Blau, M., Kakona, M. & Thompson, G. 3 definitions of BF theory on homology 3-spheres. J. High Energ. Phys. 2023, 146 (2023). https://doi.org/10.1007/JHEP04(2023)146
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DOI: https://doi.org/10.1007/JHEP04(2023)146