Abstract :

We study the large-time behaviour of a non-local evolution equation for the density of particles or individuals subject to an external and an interaction potential. In particular, we consider interaction potentials which are singular in the sense that their first derivative is discontinuous at the origin. For locally attractive singular interaction potentials we prove under a linear stability condition local non-linear stability of stationary states consisting of a finite sums of Dirac masses. For singular repulsive interaction potentials we show stability of stationary states of uniformly bounded solutions under a convexity condition. Finally, we present numerical simulations to illustrate our results.