Quantitative estimates for the Bakry–Ledoux isoperimetric inequality

  • Cong Hung Mai

    Osaka University, Japan
  • Shin-ichi Ohta

    RIKEN Center for Advanced Intelligence Project (AIP), Tokyo; and Osaka University, Japan
Quantitative estimates for the Bakry–Ledoux isoperimetric inequality cover

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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