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Peter Howard (Texas A&M)

Tuesday, October 23
4:00 PM
135 TMCB

Phase-asymptotic stability of transition front solutions in Cahn-Hilliard equations and systems

I will discuss the asymptotic behavior of perturbations of transition front solutions arising in Cahn–Hilliard equations and systems on $\mathbb{R}$ and $\mathbb{R}^n$. Such equations arise naturally in the study of phase separation processes, where a two-phase process can often be modeled by a Cahn-Hilliard equation, while a process with more than two phases can be modeled by a Cahn-Hilliard system.

When a Cahn–Hilliard equation or system is linearized about a transition front solution, the linearized operator has an eigenvalue at 0 (due to shift invariance), which is not separated from essential spectrum. In many cases, it’s possible to verify that the remaining spectrum lies on the negative real axis, so that stability is entirely determined by the nature of this leading eigenvalue. Working primarily in the case of a single equation on $\mathbb{R}$, I will discuss the nature of this leading eigenvalue and also the verification that spectral stability—defined in terms of an appropriate Evans function—implies phase-asymptotic stability. Results for scalar and multidimensional systems will be summarized.