A converse to Maz'ya's inequality for capacities under curvature lower bound

Details A converse to Maz'ya's inequality for capacities under curvature lower bound A converse to Maz'ya's inequality for capacities under curvature lower bound

2009-03-27

arxiv.org/abs/0903.4822v1

Mathematics

Functional Analysis

26 pages, to appear in Springer's International Mathematical Series Vols. 10-13

Scientific paper

We survey some classical inequalities due to Maz'ya relating isocapacitary inequalities with their functional and isoperimetric counterparts in a measure-metric space setting, and extend Maz'ya's lower bound for the $q$-capacity ($q>1$) in terms of the 1-capacity (or isoperimetric) profile. We then proceed to describe results by Buser, Bakry, Ledoux and most recently by the author, which show that under suitable convexity assumptions on the measure-metric space, Maz'ya's inequality for capacities may be reversed, up to dimension independent numerical constants: a matching lower bound on 1-capacity may be derived in terms of the $q$-capacity profile. We extend these results to handle arbitrary $q > 1$ and weak semi-convexity assumptions, by obtaining some new delicate semi-group estimates.

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