Semigroup Properties for the Second Fundamental Form

Details Semigroup Properties for the Second Fundamental Form Semigroup Properties for the Second Fundamental Form

2009-08-20

arxiv.org/abs/0908.2890v1

Mathematics

Probability

17 pages

Scientific paper

Let $M$ be a compact Riemannian manifold with boundary $\pp M$ and $L= \DD+Z$ for a $C^1$-vector field $Z$ on $M$. Several equivalent statements, including the gradient and Poincar\'e/log-Sobolev type inequalities of the Neumann semigroup generated by $L$, are presented for lower bound conditions on the curvature of $L$ and the second fundamental form of $\pp M$. The main result not only generalizes the corresponding known ones on manifolds without boundary, but also clarifies the role of the second fundamental form in the analysis of the Neumann semigroup. Moreover, the L\'evy-Gromov isoperimetric inequality is also studied on manifolds with boundary.

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