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Asymptotics of the Fast Diffusion Equation via Entropy Estimates

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Abstract

We consider non-negative solutions of the fast diffusion equation u t  = Δum with m ∈ (0, 1) in the Euclidean space \({{\mathbb R}^d}\), d ≧ 3, and study the asymptotic behavior of a natural class of solutions in the limit corresponding to t → ∞ for mm c  = (d − 2)/d, or as t approaches the extinction time when m < m c . For a class of initial data, we prove that the solution converges with a polynomial rate to a self-similar solution, for t large enough if mm c , or close enough to the extinction time if m < m c . Such results are new in the range mm c where previous approaches fail. In the range m c  < m < 1, we improve on known results.

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Correspondence to Juan Luis Vázquez.

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Communicated by V. Sverak

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Blanchet, A., Bonforte, M., Dolbeault, J. et al. Asymptotics of the Fast Diffusion Equation via Entropy Estimates. Arch Rational Mech Anal 191, 347–385 (2009). https://doi.org/10.1007/s00205-008-0155-z

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  • DOI: https://doi.org/10.1007/s00205-008-0155-z

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