A Curvature identity on a 4-dimensional Riemannian manifold
arXiv:1008.2439
Abstract
We give a curvature identity derived from the generalized Gauss-Bonnet formula for 4-dimensional compact oriented Riemannian manifolds. We prove that the curvature identity holds on any 4-dimensional Riemannian manifold which is not necessarily compact. We also provide some applications of the identity.
10 pages