Equality in the logarithmic Sobolev inequality

Shin ichi Ohta, Asuka Takatsu

Research output: Contribution to journalArticlepeer-review


We investigate the rigidity problem for the logarithmic Sobolev inequality on weighted Riemannian manifolds satisfying Ric ≥ K > 0. Assuming that equality holds, we show that the 1-dimensional Gaussian space is necessarily split off, similarly to the rigidity results of Cheng–Zhou on the spectral gap as well as Morgan on the isoperimetric inequality. The key ingredient of the proof is the needle decomposition method introduced on Riemannian manifolds by Klartag. We also present several related open problems.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2019 Apr 20

ASJC Scopus subject areas

  • General

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