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On the blow-up of solutions of a convective reaction diffusion equation

Published online by Cambridge University Press:  14 November 2011

J. Aguirre  and
M. Escobedo
J. Aguirre
Affiliation:
Departamento de Matemáticas, Universidad del País Vasco, Apartado 644, E 48080 Bilbao, Spain
M. Escobedo
Affiliation:
Departamento de Matemáticas, Universidad del País Vasco, Apartado 644, E 48080 Bilbao, Spain
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Synopsis

We study the blow-up of positive solutions of the Cauchy problem for the semilinear parabolic equation

where u is a scalar function of the spatial variable x ∈ ℝN and time t > 0, a ∈ ℝV, a ≠ 0, 1 < p and 1 ≦ q. We show that: (a) if p > 1 and 1 ≦ q ≦ p, there always exist solutions which blow up in finite time; (b) if 1 < q ≦ p ≦ min {1 + 2/N, 1 + 2q/(N + 1)} or if q = 1 and 1 < p ≦ l + 2/N, then all positive solutions blow up in finite time; (c) if q > 1 and p > min {1 + 2/N, 1 + 2q/N + 1)}, then global solutions exist; (d) if q = 1 and p > 1 + 2/N, then global solutions exist.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 123 , Issue 3 , 1993 , pp. 433 - 460
Copyright
Copyright © Royal Society of Edinburgh 1993

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