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math.AT2011
Lifting Problems and Transgression for Non-Abelian Gerbes
Thomas Nikolaus, Konrad Waldorf
We discuss various lifting and reduction problems for bundles and gerbes in the context of a strict Lie 2-group. We obtain a geometrical formulation (and a new proof) for the exact…
math.AT2011★ 16 cited
A Smooth Model for the String Group
Thomas Nikolaus, Christoph Sachse, Christoph Wockel
We construct a model for the string group as an infinite-dimensional Lie group. In a second step we extend this model by a contractible Lie group to a Lie 2-group model. To this en…