Symmetry properties for solutions of nonlocal equations involving nonlinear operators
Annales de l'I.H.P. Analyse non linéaire, Tome 36 (2019) no. 2, pp. 523-543.
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We pursue the study of one-dimensional symmetry of solutions to nonlinear equations involving nonlocal operators. We consider a vast class of nonlinear operators and in a particular case it covers the fractional p-Laplacian operator. Just like the classical De Giorgi's conjecture, we establish a Poincaré inequality and a linear Liouville theorem to provide two different proofs of the one-dimensional symmetry results in two dimensions. Both approaches are of independent interests. In addition, we provide certain energy estimates for layer solutions and Liouville theorems for stable solutions. Most of the methods and ideas applied in the current article are applicable to nonlocal operators with general kernels where the famous extension problem, given by Caffarelli and Silvestre, is not necessarily known.

DOI : 10.1016/j.anihpc.2018.07.004
Classification : 35J60, 35B35, 35B32, 35D10, 35J20
Mots-clés : Nonlocal operators, Nonlinear operators, Stable solutions, Classifications of solutions, One-dimensional solutions
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     title = {Symmetry properties for solutions of nonlocal equations involving nonlinear operators},
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Fazly, Mostafa; Sire, Yannick. Symmetry properties for solutions of nonlocal equations involving nonlinear operators. Annales de l'I.H.P. Analyse non linéaire, Tome 36 (2019) no. 2, pp. 523-543. doi : 10.1016/j.anihpc.2018.07.004. http://www.numdam.org/articles/10.1016/j.anihpc.2018.07.004/

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