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 m ≧ m 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 m ≧ m c , or close enough to the extinction time if m < m c . Such results are new in the range m ≦ m c where previous approaches fail. In the range m c < m < 1, we improve on known results.
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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