CAUCHY THEORY FOR GENERAL KINETIC VICSEK MODELS IN COLLECTIVE DYNAMICS AND MEAN-FIELD LIMIT APPROXIMATIONS

In this paper we provide a local Cauchy theory both on the torus and in the whole space for general Vicsek dynamics at the kinetic level. We consider rather general interaction kernels, nonlinear viscosity, and nonlinear friction. Particularly, we include normalized kernels which display a singularity when the flux of particles vanishes. Thus, in terms of the Cauchy theory for the kinetic equation, we extend to more general interactions and complete the program initiated in [I. M. Gamba and M.-J. Kang, Arch. Ration. Mech. Anal., 222 (2016), pp. 317-342] (where the authors assume that the singularity does not take place) and in [A. Figalli, M.-J. Kang, and J. Morales, Arch. Ration. Mech. Anal., 227 (2018), pp. 869-896] (where the authors prove that the singularity does not happen in the spatially homogeneous case). Moreover, we derive an explicit lower time of existence as well as a global existence criterion that is applicable, among other cases, to obtain a long time theory for nonrenormalized kernels and for the original Vicsek problem without any a priori assumptions. On the second part of the paper, we also establish the mean-field limit in the large particle limit for an approximated (regularized) system that coincides with the original one whenever the flux does not vanish. Based on the results proved for the limit kinetic equation, we prove that for short times, the probability that the dynamics of this approximated particle system coincides with the original singular dynamics tends to one in the many particle limit.