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Exponential separation and principal Floquet bundles for linear parabolic equations on $R^N$
Author(s) -
Juraj Húska,
Peter Poláčik
Publication year - 2008
Publication title -
discrete and continuous dynamical systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 70
eISSN - 1553-5231
pISSN - 1078-0947
DOI - 10.3934/dcds.2008.20.81
Subject(s) - floquet theory , sign (mathematics) , mathematics , exponential function , mathematical analysis , exponential growth , parabolic partial differential equation , bundle , order (exchange) , exponential dichotomy , pure mathematics , physics , partial differential equation , nonlinear system , differential equation , quantum mechanics , materials science , finance , economics , composite material
We consider linear nonautonomous second order parabolic equa- tions on R N. Under an instability condition, we prove the existence of two complementary Floquet bundles, one spanned by a positive en- tire solution - the principal Floquet bundle, the other one consisting of sign-changing solutions. We establish an exponential separation between the two bundles, showing in particular that a class of sign- changing solutions are exponentially dominated by positive solutions.

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