A discrete log-Sobolev inequality under a Bakry-Emery type condition

Abstract

We consider probability mass functions $V$ supported on the positive integers using arguments introduced by Caputo, Dai Pra and Posta, based on a Bakry--Émery condition for a Markov birth and death operator with invariant measure $V$. Under this condition, we prove a modified logarithmic Sobolev inequality, generalizing and strengthening results of Wu, Bobkov and Ledoux, and Caputo, Dai Pra and Posta. We show how this inequality implies results including concentration of measure and hypercontractivity, and discuss how it may extend to higher dimensions.

References in corpus (3)

• Entropic Ricci curvature bounds for discrete interacting systems
• Size biased couplings and the spectral gap for random regular graphs
• Poisson-type deviation inequalities for curved continuous-time Markov chains

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