Chern-Simons classes and the Ricci flow on 3-manifolds

Details Chern-Simons classes and the Ricci flow on 3-manifolds Chern-Simons classes and the Ricci flow on 3-manifolds

2010-11-12

arxiv.org/abs/1011.3055v2

Mathematics

Differential Geometry

8 pages

Scientific paper

In 1974, S.-S. Chern and J. Simons published a paper where they defined a new type of characteristic class - one that depends not just on the topology of a manifold but also on the geometry. The goal of this paper is to investigate what kinds of geometric information is contained in these classes by studying their behavior under the Ricci flow. In particular, it is shown that the Chern- Simons class corresponding to the first Pontryagin class is invariant under the Ricci flow on the warped products $S^2\times_f S^1$ and $S^1 \times_f S^2$ but that this class is not invariant under the Ricci flow on a generalized Berger sphere.

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