Quantitative estimates for the Bakry–Ledoux isoperimetric inequality
Cong Hung Mai
Osaka University, JapanShin-ichi Ohta
RIKEN Center for Advanced Intelligence Project (AIP), Tokyo; and Osaka University, Japan
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Abstract
We establish a quantitative isoperimetric inequality for weighted Riemannian manifolds with . Precisely, we give an upper bound of the volume of the symmetric difference between a Borel set and a sub-level (or super-level) set of the associated guiding function (arising from the needle decomposition), in terms of the deficit in Bakry–Ledoux’s Gaussian isoperimetric inequality. This is the first quantitative isoperimetric inequality on noncompact spaces besides Euclidean and Gaussian spaces. Our argument makes use of Klartag’s needle decomposition (also called localization), and is inspired by a recent work of Cavalletti, Maggi and Mondino on compact spaces. Besides the quantitative isoperimetry, a reverse Poincaré inequality for the guiding function that we have as a key step, as well as the way we use it, are of independent interest.
Cite this article
Cong Hung Mai, Shin-ichi Ohta, Quantitative estimates for the Bakry–Ledoux isoperimetric inequality. Comment. Math. Helv. 96 (2021), no. 4, pp. 693–739
DOI 10.4171/CMH/523