Calculus of Variations and Geometric Measure Theory
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N. Dirr - M. Lucia - M. Novaga

$\Gamma$-convergence of the Allen--Cahn energy with an oscillating forcing term

created by novaga on 07 Apr 2005
modified on 25 Jul 2005

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Submitted Paper

Inserted: 7 apr 2005
Last Updated: 25 jul 2005

Year: 2005

Abstract:

We consider a standard functional in the mesoscopic theory of phase transitions, consisting of a gradient term with a double-well potential, and we add to it a bulk term modeling the interaction with a periodic mean zero external field. This field is amplified and dilated with a power of the transition layer thickness $\epsilon$ leading to a nontrivial interaction of forcing and concentration when $\epsilon \to 0$. We show that the functionals $\Gamma$--converge after additive renormalization to an anisotropic surface energy, if the period of the oscillation is larger than the interface thickness. Difficulties arise from the fact that the functionals have non constant absolute minimizers and are not uniformly bounded from below.


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