This is the first of two articles dealing with the equation in , with , where stands for the fractional Laplacian — the infinitesimal generator of a Lévy process. This equation can be realized as a local linear degenerate elliptic equation in together with a nonlinear Neumann boundary condition on .In this first article, we establish necessary conditions on the nonlinearity f to admit certain type of solutions, with special interest in bounded increasing solutions in all of . These necessary conditions (which will be proven in a follow-up paper to be also sufficient for the existence of a bounded increasing solution) are derived from an equality and an estimate involving a Hamiltonian — in the spirit of a result of Modica for the Laplacian. Our proofs are uniform as , establishing in the limit the corresponding known results for the Laplacian.In addition, we study regularity issues, as well as maximum and Harnack principles associated to the equation.
@article{AIHPC_2014__31_1_23_0, author = {Cabr\'e, Xavier and Sire, Yannick}, title = {Nonlinear equations for fractional {Laplacians,} {I:} {Regularity,} maximum principles, and {Hamiltonian} estimates}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, pages = {23--53}, publisher = {Elsevier}, volume = {31}, number = {1}, year = {2014}, doi = {10.1016/j.anihpc.2013.02.001}, mrnumber = {3165278}, zbl = {1286.35248}, language = {en}, url = {http://www.numdam.org/articles/10.1016/j.anihpc.2013.02.001/} }
TY - JOUR AU - Cabré, Xavier AU - Sire, Yannick TI - Nonlinear equations for fractional Laplacians, I: Regularity, maximum principles, and Hamiltonian estimates JO - Annales de l'I.H.P. Analyse non linéaire PY - 2014 SP - 23 EP - 53 VL - 31 IS - 1 PB - Elsevier UR - http://www.numdam.org/articles/10.1016/j.anihpc.2013.02.001/ DO - 10.1016/j.anihpc.2013.02.001 LA - en ID - AIHPC_2014__31_1_23_0 ER -
%0 Journal Article %A Cabré, Xavier %A Sire, Yannick %T Nonlinear equations for fractional Laplacians, I: Regularity, maximum principles, and Hamiltonian estimates %J Annales de l'I.H.P. Analyse non linéaire %D 2014 %P 23-53 %V 31 %N 1 %I Elsevier %U http://www.numdam.org/articles/10.1016/j.anihpc.2013.02.001/ %R 10.1016/j.anihpc.2013.02.001 %G en %F AIHPC_2014__31_1_23_0
Cabré, Xavier; Sire, Yannick. Nonlinear equations for fractional Laplacians, I: Regularity, maximum principles, and Hamiltonian estimates. Annales de l'I.H.P. Analyse non linéaire, Tome 31 (2014) no. 1, pp. 23-53. doi : 10.1016/j.anihpc.2013.02.001. http://www.numdam.org/articles/10.1016/j.anihpc.2013.02.001/
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