Applied Math Colloquium: Dr. Ruiwen Shu

Title: Anticipation breeds alignment

Abstract:  We study the large-time behavior of  systems driven by radial potentials,  which react to \emph{anticipated} positions, ${\bf x}^\tau(t)={\bf x}(t)+\tau {\bf v}(t)$ with  anticipation increment $\tau>0$. As a special case, such systems yield the celebrated Cucker-Smale model for alignment, coupled with pairwise interactions. Viewed from this perspective, such anticipated-driven systems are expected to emerge into \emph{flocking} due to alignment of velocities, and   \emph{spatial concentration} due to confining potentials. We treat both the discrete dynamics and large crowd hydrodynamics, proving the decisive role of anticipation in driving such systems with attractive potentials into velocity alignment and spatial concentration. We also study the concentration effect  near equilibrium for anticipated-based dynamics of pair of agents governed by attractive-repulsive  potentials.