Backlund transformation and L2-stability of NLS solitons

Details Backlund transformation and L2-stability of NLS solitons Backlund transformation and L2-stability of NLS solitons

2010-11-26

arxiv.org/abs/1011.5922v2

Nonlinear Sciences

Exactly Solvable and Integrable Systems

26 pages, no figures

Scientific paper

Ground states of a L2-subcritical focusing nonlinear Schrodinger (NLS) equation are known to be orbitally stable in the energy class H1 thanks to its variational characterization. In this paper, we will show L2-orbital stability of 1-solitons to a one-dimensional cubic NLS equation for any initial data which are close to 1-solitons in L2. Moreover, we prove that if the initial data are in H3 in addition to being small in L2, then the solution remains in an L2-neighborhood of a specific 1-soliton solution for all the time. The proof relies on the Backlund transformation between zero and soliton solutions of this integrable equation.

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