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Asymptotics for a generalized Cahn-Hilliard equation with forcing terms. (English) Zbl 1222.35017

Summary: Motivated by the physical theory of critical dynamics the Cahn-Hilliard equation on a bounded space domain is considered and forcing terms of general type are introduced. For such a rescaled equation the limiting inter-face problem is studied and the following are derived: (i) asymptotic results indicating that the forcing terms may slow down the equilibrium locally or globally, (ii) the sharp interface limit problem in the multidimensional case demonstrating a local influence in phase transitions of terms that stem from the chemical potential, while free energy independent terms act on the rest of the domain, (iii) a limiting non-homogeneous linear diffusion equation for the one-dimensional problem in the case of deterministic forcing term that follows the white noise scaling.

MSC:

35B25 Singular perturbations in context of PDEs
35K58 Semilinear parabolic equations
35K35 Initial-boundary value problems for higher-order parabolic equations
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