Improved intermediate asymptotics for the heat equation |
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Authors: | Jean-Philippe Bartier Adrien Blanchet Jean Dolbeault Miguel Escobedo |
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Institution: | 1. CEREMADE (UMR CNRS no. 7534), Université Paris-Dauphine, Place de Lattre de Tassigny, 75775 Paris Cédex 16, France;2. GREMAQ (UMR CNRS no. 5604 & INRA no. 1291), Université de Toulouse, 21 Allée de Brienne, 31000 Toulouse, France;3. Departamento de Matemáticas, Universidad del País Vasco, Barrio Sarriena s/n, 48940 Lejona (Vizcaya), Spain |
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Abstract: | 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 et al. (2009) 18]. The results extend to the case of a Fokker–Planck equation with a general confining potential. |
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