Intermediate asymptotics for critical and supercritical aggregation equations and Patlak-Keller-Segel models

Abstract

We examine the long-term asymptotic behavior of dissipating solutions to aggregation equations and Patlak-Keller-Segel models with degenerate power-law and linear diffusion. The purpose of this work is to identify when solutions decay to the self-similar spreading solutions of the homogeneous diffusion equations. Combined with strong decay estimates, entropy-entropy dissipation methods provide a natural solution to this question and make it possible to derive quantitative convergence rates in L1. The estimated rate depends only on the nonlinearity of the diffusion and the strength of the interaction kernel at long range. © 2011 International Press.