Solution with finite energy to a BGK system relaxing to isentropic gas dynamics
Florent Berthelin, François Bouchut (2000)
Annales de la Faculté des sciences de Toulouse : Mathématiques
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Florent Berthelin, François Bouchut (2000)
Annales de la Faculté des sciences de Toulouse : Mathématiques
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David Hoff, Joel Smoller (1985)
Annales de l'I.H.P. Analyse non linéaire
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Florian Mehats, Jean-Michel Roquejoffre (1999)
Annales de l'I.H.P. Analyse non linéaire
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L. Hsiao, P. Marcati (1988)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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Gustaf Gripenberg (1995)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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Revista Matemática Iberoamericana
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We show that in the setting of the spatially homogeneous Boltzmann equation without cut-off, the entropy dissipation associated to a function f ∈ L(R) yields a control of √f in Sobolev norms as soon as f is locally bounded below. Under this additional assumption of lower bound, our result is an improvement of a recent estimate given by P.-L. Lions, and is optimal in a certain sense.