On a nonlocal differential equation describing roots of polynomials under differentiation

Rafael Granero-Belinchón

Published 2018-11-30Version 1

In this work we study the nonlocal transport equation derived recently by Steinerberger when studying how the distribution of roots of a polynomial behaves under iterated differentation of the function. In particular, we study the well-posedness of the equation, establish some qualitative properties of the solution and give conditions ensuring the global existence of both weak and strong solutions. Finally, we present a link between the equation obtained by Steinerberger and a one-dimensional model of the surface quasi-geostrophic equation used by Chae, C\'ordoba, C\'ordoba and Fontelos.