Construction of eternal solutions for a semilinear parabolic equation

Details Construction of eternal solutions for a semilinear parabolic equation Construction of eternal solutions for a semilinear parabolic equation

2008-05-06

arxiv.org/abs/0805.0750v1

Mathematics

Analysis of PDEs

8 pages

Scientific paper

Eternal solutions of parabolic equations (those which are defined for all time) are typically rather rare. For example, the heat equation has exactly one eternal solution -- the trivial solution. While solutions to the heat equation exist for all forward time, they cannot be extended backwards in time. Nonlinearities exasperate the situation somewhat, in that solutions may form singularities in both backward and forward time. However, semilinear parabolic equations can also support nontrivial eternal solutions. This article shows how nontrivial eternal solutions can be constructed for a semilinear equation that has at least two distinct equilibrium solutions. The resulting eternal solution is a heteroclinic orbit which connects the two given equilibria.

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