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A sharp commutator estimate for all Riesz modulated energies

2025/11/17 by Elias Hess-Childs, Hess-Childs, Elias, Matthew Rosenzweig +3 · 1 citation
Economics, Econometrics and Finance · Mathematics · #26D10 #35J70 #35Q35 #35Q70 #82C22 #82C70 #Analysis of PDEs (math.AP) #Classical Analysis and ODEs (math.CA) #FOS: Mathematics #FOS: Physical sciences #Gas Dynamics and Kinetic Theory #Mathematical Physics (math-ph) #Probability (math.PR) #Spectral Theory in Mathematical Physics #Stochastic processes and financial applications

paper · pdf · doi:10.48550/arxiv.2511.13461

openalex publication_date 2025/11/17 · openalex created_date 2025/11/19 · openalex updated_date 2026/07/28

Abstract

We prove a functional inequality in any dimension controlling the derivative along a transport of the Riesz modulated energy in terms of the modulated energy itself. This modulated energy was introduced by the third author and collaborators in the study of mean-field limits and statistical mechanics of Coulomb/Riesz gases, where this control is an essential ingredient. Previous work of the last two authors and Q.H. Nguyen arXiv:2107.02592 showed a similar functional inequality but with an additive N-dependent error (where N is the number of particles, d the dimension, and s the inverse power of the Riesz potential) which was not sharp. In this paper, we obtain the optimal N(s)/(d)-1 error, for all cases, including the sub-Coulomb case. Our method is conceptually simple and, like previous work, relies on the observation that the derivative along a transport of the modulated energy is the quadratic form of a commutator. Through a new potential truncation scheme based on a wavelet-type representation of the Riesz potential to handle its singularity, the proof reduces to averaging over a family of Kato-Ponce type estimates. The commutator estimate has applications to sharp rates of convergence for mean-field limits, quasi-neutral limits, and central limit theorems for the fluctuations of Coulomb/Riesz gases both at and out of thermal equilibrium. In particular, we show here for s<d-2 the expected N(s)/(d)-1-rate in the modulated energy distance for the mean-field convergence of first-order Hamiltonian and gradient flows. This complements the recent work arXiv:2407.15650 on the optimal rate for the (super-)Coulomb case d-2≤ s<d and therefore resolves the entire potential Riesz case.

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