Asian Journal of Mathematics

Volume 11 (2007)

Number 2

Mean Value Theorems on Manifolds

Pages: 277 – 304

DOI: http://dx.doi.org/10.4310/AJM.2007.v11.n2.a6

Author

Lei Ni

Abstract

We derive several mean value formulae on manifolds, generalizing the classical one for harmonic functions on Euclidean spaces as well as the results of Schoen-Yau, Michael-Simon, etc, on curved Riemannian manifolds. For the heat equation a mean value theorem with respect to 'heat spheres' is proved for heat equation with respect to evolving Riemannian metrics via a spacetime consideration. Some new monotonicity formulae are derived. As applications of the new local monotonicity formulae, some local regularity theorems concerning Ricci flow are proved.

Keywords

Green's function; mean value theorem; heat spheres/balls; Ricci flow; local regularity theorem

2010 Mathematics Subject Classification

58J35

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