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Cucker-Smale flocking particles with multiplicative noises: Stochastic mean-field limit and phase transition

  • * Corresponding author: Young-Pil Choi

    * Corresponding author: Young-Pil Choi 
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  • In this paper, we consider the Cucker-Smale flocking particles which are subject to the same velocity-dependent noise, which exhibits a phase change phenomenon occurs bringing the system from a "non flocking" to a "flocking" state as the strength of noises decreases. We rigorously show the stochastic mean-field limit from the many-particle Cucker-Smale system with multiplicative noises to the Vlasov-type stochastic partial differential equation as the number of particles goes to infinity. More precisely, we provide a quantitative error estimate between solutions to the stochastic particle system and measure-valued solutions to the expected limiting stochastic partial differential equation by using the Wasserstein distance. For the limiting equation, we construct global-in-time measure-valued solutions and study the stability and large-time behavior showing the convergence of velocities to their mean exponentially fast almost surely.

    Mathematics Subject Classification: Primary: 60H10, 60H15; Secondary: 82C22, 92D25.

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