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Title: Convergence and sharp thresholds for propagation in nonlinear diffusion problems
Contributor(s): Du, Yihong  (author); Matano, Hiroshi (author)
Publication Date: 2010
DOI: 10.4171/JEMS/198
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Abstract: We study the Cauchy problem ut = uxx + f(u) (t > 0, x ∈ ℝ¹), u(0, x) = uₒ(x) (x ∈ ℝ¹), where f(u) is a locally Lipschitz continuous function satisfying f(0) = 0. We show that any nonnegative bounded solution with compactly supported initial data converges to a stationary solution as t → ∞. Moreover, the limit is either a constant or a symmetrically decreasing stationary solution. We also consider the special case where f is a bistable nonlinearity and the case where f is a combustion type nonlinearity. Examining the behavior of a parameter-dependent solution uλ, we show the existence of a sharp threshold between extinction (i.e., convergence to 0) and propagation (i.e., convergence to 1). The result holds even if f has a jumping discontinuity at u = 1.
Publication Type: Journal Article
Source of Publication: Journal of the European Mathematical Society, 12(2), p. 279-312
Publisher: European Mathematical Society Publishing House
Place of Publication: Switzerland
ISSN: 1435-9855
Field of Research (FOR): 010110 Partial Differential Equations
Socio-Economic Outcome Codes: 970101 Expanding Knowledge in the Mathematical Sciences
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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Appears in Collections:Journal Article
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