Improved intermediate asymptotics for the heat equation

Details Improved intermediate asymptotics for the heat equation Improved intermediate asymptotics for the heat equation

2009-08-16

arxiv.org/abs/0908.2226v1

Mathematics

Analysis of PDEs

Scientific paper

This letter is devoted to results on intermediate asymptotics for the heat equation. We study the convergence towards a stationary solution in self-similar variables. By assuming the equality of some moments of the initial data and of the stationary solution, we get improved convergence rates using entropy / entropy-production methods. We establish the equivalence of the exponential decay of the entropies with new, improved functional inequalities in restricted classes of functions. This letter is the counterpart in a linear framework of a recent work on fast diffusion equations, see [Bonforte-Dolbeault-Grillo-Vazquez]. Results extend to the case of a Fokker-Planck equation with a general confining potential.

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