Decay of dissipative equations and negative Sobolev spaces

Details Decay of dissipative equations and negative Sobolev spaces Decay of dissipative equations and negative Sobolev spaces

2011-11-24

arxiv.org/abs/1111.5660v1

Mathematics

Analysis of PDEs

Scientific paper

We develop a general energy method for proving the optimal time decay rates of the solutions to the dissipative equations in the whole space. Our method is applied to classical examples such as the heat equation, the compressible Navier-Stokes equations and the Boltzmann equation. In particular, the optimal decay rates of the higher-order spatial derivatives of solutions are obtained. The negative Sobolev norms are shown to be preserved along time evolution and enhance the decay rates. We use a family of scaled energy estimates with minimum derivative counts and interpolations among them without linear decay analysis.

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