WIAS Preprint No. 2024, (2014)

1D symmetry for semilinear PDEs from the limit interface of the solution


  • Farina, Alberto
  • Valdinoci, Enrico
    ORCID: 0000-0001-6222-2272

2010 Mathematics Subject Classification

  • 5J61 35J15


  • Phase transitions, symmetry results, limit interface




We study bounded, entire, monotone solutions of the Allen-Cahn equation. We prove that under suitable assumptions on the limit interface and on the energy growth, the solution is 1D. In particular, differently from the previous literature, the solution is not assumed to have minimal properties. We think that this approach could be fruitful in concrete situations, where one can observe the phase separation at a large scale and whishes to deduce the values of the state parameter in the vicinity of the interface. As a simple example of the results obtained with this point of view, we mention that monotone solutions with energy bounds, whose limit interface does not contain a vertical line through the origin, are 1D, at least up to dimension 4.

Appeared in

  • Comm. Partial Differential Equations, 41 (2016) pp. 665--682.

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