Local monotonicity and mean value formulas for evolving Riemannian manifolds

Abstract

We derive identities for general flows of Riemannian metrics that may be regarded as local mean-value, monotonicity, or Lyapunov formulae. These generalize previous work of the first author for mean curvature flow and other nonlinear diffusions. Our results apply in particular to Ricci flow, where they yield a local monotone quantity directly analogous to Perelman's reduced volume V and a local identity related to Perelman's average energy F.

References in corpus (2)

• Gaussian densities and stability for some Ricci solitons
• Sharp gradient estimate and Yau's Liouville theorem for the heat equation on noncompact manifolds