Small inertia limit of the distribution-dependent stochastic Cucker--Smale equation
Abstract
This paper investigates the small inertia limit of the distribution-dependent stochastic Cucker--Smale equation with the full velocity alignment source term, which serves as the mean-field equation for the stochastic Cucker--Smale model. Inspired by the idea of Hottovy et al. \cite{Hottovy2015} to rearrange SDEs via integration by parts, we repeatedly perform integration by parts on independent copies of our equation. Then we define a global position correction and a quadratic remainder, both with uniformly bounded tails. Applying the Aldous criterion, we obtain tightness of the position correction, which in turn yields tightness of the position process. Subsequently, using the averaging method on the fast time scale, the quadratic functional can be decomposed into the equilibrium average, local quadratic fluctuations, and exponential transients. Then, the Poisson--Lyapunov equation is employed to prove the convergence of the time integral. Finally, under various suitable assumptions, we obtain the weak convergence of the laws of the approximating processes to the law of the solution of the small-inertia limit equation, along with the identification of the limiting process, and also the convergence rate of strong L1-convergence. The extra noise-induced drift term can be expressed as the solution of a contraction-type Fredholm equation. This paper is complementary to the deterministic particle limit work of \cite{Carrillo2021,Choi2021} .
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BibTeX
@misc{huang2026small,
title = {{Small inertia limit of the distribution-dependent stochastic Cucker--Smale equation}},
author = {Jizhao Huang and Yan Lv and Wei Wang},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.06511},
eprint = {2611.06511},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.06511},
}
RIS
TY - UNPB
TI - Small inertia limit of the distribution-dependent stochastic Cucker--Smale equation
AU - Jizhao Huang
AU - Yan Lv
AU - Wei Wang
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2611.06511
UR - https://arxiv.org/abs/2611.06511
AB - This paper investigates the small inertia limit of the distribution-dependent stochastic Cucker--Smale equation with the full velocity alignment source term, which serves as the mean-field equation for the stochastic Cucker--Smale model. Inspired by the idea of Hottovy et al. \cite{Hottovy2015} to rearrange SDEs via integration by parts, we repeatedly perform integration by parts on independent copies of our equation. Then we define a global position correction and a quadratic remainder, both with uniformly bounded tails. Applying the Aldous criterion, we obtain tightness of the position correction, which in turn yields tightness of the position process. Subsequently, using the averaging method on the fast time scale, the quadratic functional can be decomposed into the equilibrium average, local quadratic fluctuations, and exponential transients. Then, the Poisson--Lyapunov equation is employed to prove the convergence of the time integral. Finally, under various suitable assumptions, we obtain the weak convergence of the laws of the approximating processes to the law of the solution of the small-inertia limit equation, along with the identification of the limiting process, and also the convergence rate of strong L^1-convergence. The extra noise-induced drift term can be expressed as the solution of a contraction-type Fredholm equation. This paper is complementary to the deterministic particle limit work of \cite{Carrillo2021,Choi2021} .
ER -