A Convexity Theorem in the Scattering Theory for the Dirac Operator

Details A Convexity Theorem in the Scattering Theory for the Dirac Operator A Convexity Theorem in the Scattering Theory for the Dirac Operator

1996-07-16

arxiv.org/abs/solv-int/9607004v1

Trans. AMS, vol 350, no. 5, pp. 1895--1911.

Nonlinear Sciences

Exactly Solvable and Integrable Systems

20 pages, AMS-TEX

Scientific paper

The Dirac operator enters into zero curvature representation for the cubic nonlinear Schr\"{o}dinger equation. We introduce and study a conformal map from the upper half-plane of the spectral parameter of the Dirac operator into itself. The action variables turn out to be limiting boundary values of the imaginary part of this map. We describe the image of the momentum map (convexity theorem) in the simplest case of a potential from the Schwartz class. We apply this description to the invariant manifolds for the nonlinear Schr\"{o}dinger equation.

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