Archive for Rational Mechanics and Analysis

, Volume 109, Issue 1, pp 73–80 | Cite as

The value of the critical exponent for reaction-diffusion equations in cones

  • Howard A. Levine
  • Peter Meier
Article

Abstract

Let DR N be a cone with vertex at the origin i.e., D = (0, ∞)xΩ where Ω ⊂ SN−1 and x ε D if and only if x = (r, θ) with r=¦x¦, θ ε Ω. We consider the initial boundary value problem: u t = Δu+u p in D×(0, T), u=0 on ∂Dx(0, T) with u(x, 0)=u0(x) ≧ 0. Let ω1 denote the smallest Dirichlet eigenvalue for the Laplace-Beltrami operator on Ω and let γ+ denote the positive root of γ(γ+N−2) = ω1. Let p* = 1 + 2/(N + γ+). If 1 < p < p*, no positive global solution exists. If p>p*, positive global solutions do exist. Extensions are given to the same problem for ut=Δ+¦x¦ σ u p .

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • Howard A. Levine
    • 1
  • Peter Meier
    • 1
  1. 1.Department of MathematicsIowa State UniversityAmes

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