Decay of the non-isentropic Navier-Stokes-Poisson equations

We establish the time decay rates of the solution to the Cauchy problem for the non-isentropic compressible Navier-Stokes-Poisson system via a refined pure energy method. In particular, the optimal decay rates of the higher-order spatial derivatives of the solution are obtained. As a corollary, we also obtain the usual Lp−L2(1