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Convergence of Anisotropically Decaying Solutions of a Supercritical Semilinear Heat Equation

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Abstract

We consider the Cauchy problem for a semilinear heat equation with a supercritical power nonlinearity. It is known that the asymptotic behavior of solutions in time is determined by the decay rate of their initial values in space. In particular, if an initial value decays like a radial steady state, then the corresponding solution converges to that steady state. In this paper we consider solutions whose initial values decay in an anisotropic way. We show that each such solution converges to a steady state which is explicitly determined by an average formula. For a proof, we first consider the linearized equation around a singular steady state, and find a self-similar solution with a specific asymptotic behavior. Then we construct suitable comparison functions by using the self-similar solution, and apply our previous results on global stability and quasi-convergence of solutions.

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Authors and Affiliations

  1. School of Mathematics, University of Minnesota, Minneapolis, MN, 55455, USA

    Peter Poláčik

  2. Mathematical Institute, Tohoku University, Sendai, 980-8578, Japan

    Eiji Yanagida

Authors
  1. Peter Poláčik
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  2. Eiji Yanagida
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Correspondence to Eiji Yanagida.

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Poláčik, P., Yanagida, E. Convergence of Anisotropically Decaying Solutions of a Supercritical Semilinear Heat Equation. J Dyn Diff Equat 21, 329–341 (2009). https://doi.org/10.1007/s10884-009-9136-7

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  • DOI: https://doi.org/10.1007/s10884-009-9136-7

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