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arXiv · 2609.35666

Interacting fronts in the strongly nonlocal Allen--Cahn equation

Erisa Hasani·Stefania Patrizi
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Abstract

We study the sharp-interface limit of the fractional Allen--Cahn equation in $\R^n$, $n\geq 2$, in the strongly nonlocal regime $s\in(0,\frac12)$, for initial data consisting of finitely many nested transition layers. We identify a coupled geometric law for the motion of the resulting fronts: each velocity contains fractional mean curvature and a nonlocal interaction potential generated by the other fronts. These interactions persist while the fronts remain separated, in contrast to the independent motion in the critical regime $s=\frac12$. Assuming that the coupled law admits a smooth evolution with strictly nested sets on a given time interval, we prove that the Allen--Cahn solutions converge locally uniformly away from the moving fronts to the corresponding integer-valued phases.

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Erisa Hasani, Stefania Patrizi. 2026-09-28. Interacting fronts in the strongly nonlocal Allen--Cahn equation. https://arxiv.org/abs/2609.35666

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