Uniform semiclassical approximations of the nonlinear Schroedinger equation by a Painleve mapping

Details Uniform semiclassical approximations of the nonlinear Schroedinger equation by a Painleve mapping Uniform semiclassical approximations of the nonlinear Schroedinger equation by a Painleve mapping

2006-08-11

arxiv.org/abs/quant-ph/0608099v1

J. Phys. A: Math. Gen. 39, 14687 (2006)

Physics

Quantum Physics

Scientific paper

10.1088/0305-4470/39/47/012

A useful semiclassical method to calculate eigenfunctions of the Schroedinger equation is the mapping to a well-known ordinary differential equation, as for example Airy's equation. In this paper we generalize the mapping procedure to the nonlinear Schroedinger equation or Gross-Pitaevskii equation describing the macroscopic wave function of a Bose-Einstein condensate. The nonlinear Schroedinger equation is mapped to the second Painleve equation, which is one of the best-known differential equations with a cubic nonlinearity. A quantization condition is derived from the connection formulae of these functions. Comparison with numerically exact results for a harmonic trap demonstrates the benefit of the mapping method. Finally we discuss the influence of a shallow periodic potential on bright soliton solutions by a mapping to a constant potential.

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