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Article Dans Une Revue Discrete and Continuous Dynamical Systems - Series A Année : 2010

Looking for critical nonlinearity in the one-dimensional quasilinear Smoluchowski-Poisson system

Résumé

It is known that classical solutions to the one-dimensional quasilinear Smoluchowski-Poisson system with nonlinear diffusion a(u) = (1 + u) −p may blow up in finite time if p > 1 and exist globally if p < 1. The case p = 1 thus appears to be critical but it turns out that all solutions are global also in that case. Two classes of diffusion coefficients are actually identified in this paper, one for which all solutions to the corresponding quasilinear Smoluchowski-Poisson system are global and the other one leading to finite time blow-up for sufficiently concentrated initial data. The cornerstone of the proof are an alternative formulation of the Smoluchowski-Poisson system which relies on a novel change of variables and a virial identity.
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Dates et versions

hal-00629520 , version 1 (07-03-2018)

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Tomasz Cieślak, Philippe Laurençot. Looking for critical nonlinearity in the one-dimensional quasilinear Smoluchowski-Poisson system. Discrete and Continuous Dynamical Systems - Series A, 2010, 26 (2), pp.417-430. ⟨10.3934/dcds.2010.26.417⟩. ⟨hal-00629520⟩
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