Equality of particle-system and mean-field log-Sobolev constants

Let λLSN\lambda^N_{\operatorname{LS}} denote the log-Sobolev constant of the NN-particle system, and let λLS\lambda^\infty_{\operatorname{LS}} denote the corresponding mean-field constant. Assume that the hypotheses A1 and A2 hold.

Log-Sobolev constant limit conjecture. Under assumptions A1 and A2,

limNλLSN=λLS.\lim_{N\to\infty}\lambda^N_{\operatorname{LS}}=\lambda^\infty_{\operatorname{LS}}.

This conjecture would complete the characterisation of the limiting log-Sobolev constant in terms of the mean-field system. The paper gives evidence through degeneracy and contraction results, but states that the full characterisation remains unresolved.

Sources & referencesView supporting material

Primary source

Matías G. Delgadino, Rishabh S. Gvalani, Grigorios A. Pavliotis and Scott A. Smith, “Phase transitions, logarithmic Sobolev inequalities, and uniform-in-time propagation of chaos for weakly interacting diffusions”, arXiv:2112.06304 (2021).

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