The optimal temporal decay estimates for the fractional power dissipative equation in negative Besov spaces

Abstract

In this paper, we first generalize a new energy approach, developed by Guo and Wang [Commun. Partial Differ. Equations 37, 2165–2208 (2012)] in the framework of homogeneous Besov spaces for proving the optimal temporal decay rates of solutions to the fractional power dissipative equation, then we apply this approach to the critical and supercritical surface quasi-geostrophic equation and the critical Keller-Segel system. We show that certain weighted negative Besov norm of solutions is preserved along time evolution and obtain the optimal temporal decay rates of the spatial derivatives of solutions by the Fourier splitting approach and the interpolation techniques.