Dispersion for Schrödinger equation with periodic potential in 1D

Details Dispersion for Schrödinger equation with periodic potential in 1D Dispersion for Schrödinger equation with periodic potential in 1D

2006-11-29

arxiv.org/abs/math/0611919v2

Mathematics

Analysis of PDEs

Scientific paper

We extend a result on dispersion for solutions of the linear Schr\"odinger equation, proved by Firsova for operators with finitely many energy bands only, to the case of smooth potentials in 1D with infinitely many bands. The proof consists in an application of the method of stationary phase. Estimates for the phases, essentially the band functions, follow from work by Korotyaev. Most of the paper is devoted to bounds for the Bloch functions. For these bounds we need a detailed analysis of the quasimomentum function and the uniformization of the inverse of the quasimomentum function

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