Isoperimetric Bounds on Convex Manifolds

Details Isoperimetric Bounds on Convex Manifolds Isoperimetric Bounds on Convex Manifolds

2010-04-04

arxiv.org/abs/1004.0485v2

Mathematics

Functional Analysis

16 pages; addressed referee's comments; to appear in Contemporary Math., proceedings of the Workshop on "Concentration,Functio

Scientific paper

We extend several Cheeger-type isoperimetric bounds for convex sets in Euclidean space, due to Bobkov and Kannan-Lov\'asz-Simonovits, to Riemannian manifolds having non-negative Ricci curvature. In order to extend Bobkov's bound, we require in addition an upper bound on the sectional curvature of the space, which permits us to use comparison tools in Cartan-Alexandrov-Toponogov (or CAT) spaces. Along the way, we also quantitatively improve our previous result that weak concentration assumptions imply a Cheeger-type isoperimetric bound, to a sharp bound with respect to all parameters.

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