T Boulenger, E Lenzmann - Annales scientifiques de l'École Normale …, 2017 - numdam.org
A.–We consider the Cauchy problem for the biharmonic (ie, fourth-order) NLS
with focusing nonlinearity given by i@ tu D 2u u juj2 u for. t; x/2 Œ0; T/Rd; where 0<< 1 for …