Connections on central extensions, lifting gerbes, and finite-dimensional obstruction vanishing
Differential Geometry
2019-11-21 v2
Abstract
Given a central extension of Lie groups, we study the classification problem of lifting the structure group together with a given connection. For reductive structure groups we introduce a new connective structure on the lifting gerbe associated to this problem. Our main result classifies all connections on the central extension of a given principal bundle. In particular, we find that admissible connections are in one-to-one correspondence with parallel trivializations of the lifting gerbe. Moreover, we prove a vanishing result for Neeb's obstruction classes for finite-dimensional Lie groups.
Keywords
Cite
@article{arxiv.1910.10402,
title = {Connections on central extensions, lifting gerbes, and finite-dimensional obstruction vanishing},
author = {Indranil Biswas and Markus Upmeier},
journal= {arXiv preprint arXiv:1910.10402},
year = {2019}
}
Comments
16 pages. Final version, to appear in the Geometry at the Frontier conference proceedings