Decay of global solutions, stability and blowup for a reaction-diffusion problem with free boundary

Ghidouche, Hamid; Souplet, Philippe; Tarzia, Domingo

doi:10.1090/S0002-9939-00-05705-1

Decay of global solutions, stability and blowup for a reaction-diffusion problem with free boundary
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by Hamid Ghidouche, Philippe Souplet and Domingo Tarzia

Proc. Amer. Math. Soc. 129 (2001), 781-792

DOI: https://doi.org/10.1090/S0002-9939-00-05705-1

Published electronically: September 20, 2000

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Abstract:

We consider a one-phase Stefan problem for the heat equation with a nonlinear reaction term. We first exhibit an energy condition, involving the initial data, under which the solution blows up in finite time in $L^\infty$ norm. We next prove that all global solutions are bounded and decay uniformly to 0, and that either: (i) the free boundary converges to a finite limit and the solution decays at an exponential rate, or (ii) the free boundary grows up to infinity and the decay rate is at most polynomial. Finally, we show that small data solutions behave like (i).

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