Local Poincare inequalities in non-negative curvature and finite dimension

摘要

In this paper, we derive a new set of Poincare inequalities on the sphere, with respect to some Markov kernels parameterized by a point in the ball. When this point goes to the boundary, those Poincare inequalities are shown to give the curvature-dimension inequality of the sphere, and when it is at the center they reduce to the usual Poincare inequality. We then extend them to Riemannian manifolds, giving a sequence of inequalities which are equivalent to the curvature-dimension inequality, and interpolate between this inequality and the Poincare inequality for the invariant measure. This inequality is optimal in the case of the spheres. (C) 2002 Elsevier Science (USA). All rights reserved. [References: 14]