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arXiv · 1810.08369

On the Poincar{\'e} constant of log-concave measures

Patrick Cattiaux·Arnaud Guillin
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Abstract

The goal of this paper is to push forward the study of those properties of log-concave measures that help to estimate their Poincar{\'e} constant. First we revisit E. Milman's result [40] on the link between weak (Poincar{\'e} or concentration) inequalities and Cheeger's inequality in the logconcave cases, in particular extending localization ideas and a result of Latala, as well as providing a simpler proof of the nice Poincar{\'e} (dimensional) bound in the inconditional case. Then we prove alternative transference principle by concentration or using various distances (total variation, Wasserstein). A mollification procedure is also introduced enabling, in the logconcave case, to reduce to the case of the Poincar{\'e} inequality for the mollified measure. We finally complete the transference section by the comparison of various probability metrics (Fortet-Mourier, bounded-Lipschitz,...).

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Patrick Cattiaux, Arnaud Guillin. 2018-10-19. On the Poincar{\'e} constant of log-concave measures. https://arxiv.org/abs/1810.08369

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