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Exponential dichotomy of evolution equations and admissibility of function spaces on a half-line. (English) Zbl 1126.47060

The author considers an evolution family 𝒰=(U(t,s)) ts0 on + and the integral equation

u(t)=U(t,s)u(s)+ s t U(t,ξ)f(ξ)dξ·

He characterizes the exponential dichotomy of the evolution family through the solvability of this integral equation in admissible function spaces which contain function spaces of L p type, the Lorentz spaces L p,q , and many other function spaces occurring in interpolation theory.

The paper applies the technique of choosing test functions related to integral equations. This technique allows to use the Banach isomorphism theorem applied to an abstract differential operator for obtaining explicit dichotomy estimates.

Using the characterization of exponential dichotomy, the author proves the robustness of exponential dichotomy of evolution families on + under small perturbations.

47N20Applications of operator theory to differential and integral equations
47D06One-parameter semigroups and linear evolution equations
34D09Dichotomy, trichotomy
34G10Linear ODE in abstract spaces
35B35Stability of solutions of PDE
35B40Asymptotic behavior of solutions of PDE
35K20Second order parabolic equations, initial boundary value problems
35K55Nonlinear parabolic equations