Quasi-linear dynamics in nonlinear Schr\" odinger equation with periodic boundary conditions
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It is shown that a large subset of initial data with finite energy ($L^2$ norm)evolves nearly linearly in nonlinear Schr\" odinger equation with periodic boundary conditions. These new solutions are not perturbations of the known ones such as solitons, semiclassical or weakly linear solutions.
19 pages
19 pages