Abstract

In this paper, we prove that every sequence of solutions to the linear Schrödinger equation, with bounded data in H1(Rd), d⩾3, can be written, up to a subsequence, as an almost orthogonal sum of sequences of the type h−(d−2)/2nV((t−tn)/h2n, (x−xn)/ hn ), where V is a solution of the linear Schrödinger equation, with a small remainder term in Strichartz norms. Using this decomposition, we prove a similar one for the defocusing H1-critical nonlinear Schrödinger equation, assuming that the initial data belong to a ball in the energy space where the equation is solvable. This implies, in particular, the existence of an a priori estimate of the Strichartz norms in terms of the energy.

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