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Exponential separation and principal Floquet bundles for linear parabolic equations on $R^N$
We consider linear nonautonomous second order parabolic equations
on $\R^N$. Under an instability condition, we prove the existence of
two complementary Floquet bundles, one spanned by a positive entire
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.