On the ring structure of spark characters

Details On the ring structure of spark characters On the ring structure of spark characters

2008-08-05

arxiv.org/abs/0808.0724v2

Mathematics

Differential Geometry

fixed a few typos

Scientific paper

We give a new description of the ring structure on the differential characters of a smooth manifold via the smooth hyperspark complex. We show the explicit product formula, and as an application, calculate the product for differential characters of the unit circle. Applying the presentation of spark classes by smooth hypersparks, we give an explicit construction of the isomorphism between groups of spark classes and the $(p,p)$ part of smooth Deligne cohomology groups associated to a smooth manifold. We then give a new direct proof that this is an isomorphism of ring structures.

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