报告人：张雄韬，华中科技大学

地点：明德楼B区201报告厅

题目1：Mean-Field Limit for the Cucker-Smale Model I: Regular Case

时间：2019.10.10, 14:30

题目2：Mean-Field Limit for the Cucker-Smale Model II: Singular Case

时间：2019.10.10, 15:30

摘要：We introduce the rigorous mean field limit from Cucker-Smale model (CS) to kinetic CS model (KCS) with regular and singular interaction respectively. For regular interaction, the global-in-time stability of flocking states will be addressed. As a direct application of the uniform stability, we obtain the uniform-in-time mean-field limit in the Wasserstein metric. While for C-S model with singular interaction, uniform stability has not been obtained so far, and we will present a probabilistic approach for derivation of the KCS equation from the particle CS model with singular communication. More precisely, we introduce a suitable cutoff in the communication weight, and derive the estimates of the difference between particle trajectory and the kinetic trajectory for cutoff equations. Then we show the cutoff will tends to zero when particle number N tends to infinity and thus verify the mean field limit.