Multiplicative bundle gerbes with connection
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In this article, it was shown that multiplicative bundle gerbes with connection furnish geometrical constructions of the following objects: smooth central extensions of loop groups, Chern-Simons actions for arbitrary gauge groups, and symmetric bi-branes for WZW models with topological defect lines.Abstract:
Multiplicative bundle gerbes are gerbes over a Lie group which are compatible with the group structure. In this article connections on such bundle gerbes are introduced and studied. It is shown that multiplicative bundle gerbes with connection furnish geometrical constructions of the following objects: smooth central extensions of loop groups, Chern–Simons actions for arbitrary gauge groups, and symmetric bi-branes for WZW models with topological defect lines.read more
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TL;DR: In this article, a 3-dimensional analogue of the Kostant-Weil theory of line bundles is presented, where the curvature of a fiber bundle becomes a three-dimensional form.