2 9 Ju l 2 00 3 Equivariant smooth Deligne cohomology

On the basis of Brylinski’s work, we introduce a notion of equivariant smooth Deligne cohomology group, which is a generalization of both the ordinary smooth Deligne cohomology and the ordinary equivariant cohomology. Using the cohomology group, we classify equivariant circle bundles with connection, and equivariant gerbes with connection.

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