The geometry of unitary 2-representations of finite groups and their 2-characters

Details The geometry of unitary 2-representations of finite groups and their 2-characters The geometry of unitary 2-representations of finite groups and their 2-characters

2008-07-09

arxiv.org/abs/0807.1329v2

Mathematics

Quantum Algebra

50 pages, 148 diagrams. Removed two erroneous claims from the introduction, and some minor errors fixed

Scientific paper

Motivated by topological quantum field theory, we investigate the geometric aspects of unitary 2-representations of finite groups on 2-Hilbert spaces, and their 2-characters. We show how the basic ideas of geometric quantization are `categorified' in this context: just as representations of groups correspond to equivariant line bundles, 2-representations of groups correspond to equivariant gerbes. We also show how the 2-character of a 2-representation can be made functorial with respect to morphisms of 2-representations. Under the geometric correspondence, the 2-character of a 2-representation corresponds to the geometric character of its associated equivariant gerbe. This enables us to show that the complexified 2-character is a unitarily fully faithful functor from the complexified homotopy category of unitary 2-representations to the category of unitary equivariant vector bundles over the group.

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