Bifurcation for a sharp interface generation problem

  • Emilio D. Acerbi

    University of Parma, Italy
  • Chao-Nien Chen

    National Tsing Hua University, Hsinchu, Taiwan
  • Yung Sze Choi

    University of Connecticut, Storrs, USA
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Abstract

As opposed to the widely studied bifurcation phenomena for maps or PDE problems, we are concerned with bifurcation for stationary points of a nonlocal variational functional defined not on functions but on sets of finite perimeter, and involving a nonlocal term. This sharp interface model (1.2), arised as the -limit of the FitzHugh–Nagumo energy functional in a (flat) square torus in of size , possesses lamellar stationary points of various widths with well-understood stability ranges and exhibits many interesting phenomena of pattern formation as well as wave propagation. We prove that when the lamella loses its stability, bifurcation occurs, leading to a two-dimensional branch of nonplanar stationary points. Thinner nonplanar structures, achieved through a smaller , or multiple layered lamellae in the same-sized torus, are more stable. To the best of our knowledge, bifurcation for nonlocal problems in a geometric measure theoretic setting is an entirely new result.

Cite this article

Emilio D. Acerbi, Chao-Nien Chen, Yung Sze Choi, Bifurcation for a sharp interface generation problem. Interfaces Free Bound. 27 (2025), no. 3, pp. 403–457

DOI 10.4171/IFB/538