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- W3022969285 abstract "Abstract We study bundle gerbes on manifolds M that carry an action of a connected Lie group G . We show that these data give rise to a smooth 2-group extension of G by the smooth 2-group of hermitean line bundles on M . This 2-group extension classifies equivariant structures on the bundle gerbe, and its non-triviality poses an obstruction to the existence of equivariant structures. We present a new global approach to the parallel transport of a bundle gerbe with connection, and use it to give an alternative construction of this smooth 2-group extension in terms of a homotopy-coherent version of the associated bundle construction. We apply our results to give new descriptions of nonassociative magnetic translations in quantum mechanics and the Faddeev–Mickelsson–Shatashvili anomaly in quantum field theory. We also propose a definition of smooth string 2-group models within our geometric framework. Starting from a basic gerbe on a compact simply-connected Lie group G , we prove that the smooth 2-group extensions of G arising from our construction provide new models for the string group of G ." @default.
- W3022969285 created "2020-05-13" @default.
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- W3022969285 date "2021-05-25" @default.
- W3022969285 modified "2023-10-18" @default.
- W3022969285 title "Smooth 2-Group Extensions and Symmetries of Bundle Gerbes" @default.
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- W3022969285 doi "https://doi.org/10.1007/s00220-021-04099-7" @default.
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