Averaging, Conley index continuation and recurrent dynamics in almost-periodic parabolic equations

Details Averaging, Conley index continuation and recurrent dynamics in almost-periodic parabolic equations Averaging, Conley index continuation and recurrent dynamics in almost-periodic parabolic equations

2004-02-03

arxiv.org/abs/math/0402040v1

Mathematics

Analysis of PDEs

19 pages

Scientific paper

We study a non-autonomous parabolic equation with almost-periodic, rapidly oscillating principal part and nonlinear interactions. We associate to the equation a skew-product semiflow and, for a special class of nonlinearities, we define the Conley index of an isolated invariant set. As the frequency of the oscillations tends to infinity, we prove that every isolated invariant set of the averaged autonomous equation can be continued to an isolated invariant set of the skew-product semiflow associated to the non-autonomous equation. Finally, we illustrate some examples in which the Conley index can be explicitely computed and can be exploited to detect the existence of recurrent dynamics in the equation.

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