Transverse Evolution Operator for the Gross-Pitaevskii Equation in Semiclassical Approximation

TL;DR

This paper develops a semiclassical approximation method for the Gross-Pitaevskii equation using a transverse evolution operator, providing analytic solutions near phase surfaces in many-dimensional systems.

Contribution

It introduces a novel transverse evolution operator approach within the complex WKB-Maslov framework for the Gross-Pitaevskii equation.

Findings

Constructed analytic asymptotic solutions in semiclassical limit

Applied the method to examples demonstrating effectiveness

Extended the complex WKB-Maslov method to multidimensional systems

Abstract

The Gross-Pitaevskii equation with a local cubic nonlinearity that describes a many-dimensional system in an external field is considered in the framework of the complex WKB-Maslov method. Analytic asymptotic solutions are constructed in semiclassical approximation in a small parameter $\hbar$, $\hbar\to 0$, in the class of functions concentrated in the neighborhood of an unclosed surface associated with the phase curve that describes the evolution of surface vertex. The functions of this class are of the one-soliton form along the direction of the surface normal. The general constructions are illustrated by examples.