Differential Geometry of Gerbes

Details Differential Geometry of Gerbes Differential Geometry of Gerbes

2001-06-11

arxiv.org/abs/math/0106083v3

Mathematics

Algebraic Geometry

78 pages. Uses XyPic. A number of significant additions have been incorporated into this version. This includes a description

Scientific paper

We define in a global manner the notion of a connective structure for a gerbe on a space X. When the gerbe is endowed with trivializing data with respect to an open cover of X, we describe this connective structure in two separate ways, which extend from abelian to general gerbes the corresponding descriptions due to J.- L. Brylinski and N. Hitchin. We give a global definition of the 3-curvature of this connective structure as a 3-form on X with values in the Lie stack of the gauge stack of the gerbe. We also study this notion locally in terms of more traditional Lie algebra-valued 3-forms. The Bianchi identity, which the curvature of a connection on a principal bundle satisfies, is replaced here by a more elaborate equation.

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