Abstract
We study semilinear elliptic equationsδu + cu x =f(u,∇u) andδ 2 u + cu x =f(u,∇u,∇ 2 u) in infinite cylinders (x,y) ∃ ℝ×Ω⊂ℝ n+1 using methods from dynamical systems theory. We construct invariant manifolds, which contain the set of bounded solutions and then study a singular limitc→∞, where the equations change type from elliptic to parabolic. In particular we show that on the invariant manifolds, the elliptic equation generates a smooth dynamical system, which converges to the dynamical system generated by the parabolic limit equation. Our results imply the existence of fast traveling waves for equations like a viscous reactive 2d-Burgers equation or the Cahn-Hillard equation in infinite strips.
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Scheel, A. Existence of fast traveling waves for some parabolic equations: A dynamical systems approach. J Dyn Diff Equat 8, 469–547 (1996). https://doi.org/10.1007/BF02218843
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DOI: https://doi.org/10.1007/BF02218843