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arXiv · 1710.09629

Flat connections in three-manifolds and classical Chern-Simons invariant

Enore Guadagnini·Philippe Mathieu·Frank Thuillier
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Abstract

A general method for the construction of smooth flat connections on 3-manifolds is introduced. The procedure is strictly connected with the deduction of the fundamental group of a manifold M by means of a Heegaard splitting presentation of M. For any given matrix representation of the fundamental group of M, a corresponding flat connection A on M is specified. It is shown that the associated classical Chern-Simons invariant assumes then a canonical form which is given by the sum of two contributions: the first term is determined by the intersections of the curves in the Heegaard diagram, and the second term is the volume of a region in the representation group which is determined by the representation of pi_1(M) and by the Heegaard gluing homeomorphism. Examples of flat connections in topologically nontrivial manifolds are presented and the computations of the associated classical Chern-Simons invariants are illustrated.

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Enore Guadagnini, Philippe Mathieu, Frank Thuillier. 2017-10-26. Flat connections in three-manifolds and classical Chern-Simons invariant. https://doi.org/10.1016/j.nuclphysb.2017.10.021

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