# A basis-set based Fortran program to solve the Gross–Pitaevskii equation for dilute Bose gases in harmonic and anharmonic traps

## Description

Abstract Inhomogeneous boson systems, such as the dilute gases of integral spin atoms in low-temperature magnetic traps, are believed to be well described by the Gross–Pitaevskii equation (GPE). GPE is a nonlinear Schrödinger equation which describes the order parameter of such systems at the mean field level. In the present work, we describe a Fortran 90 computer program developed by us, which solves the GPE using a basis set expansion technique. In this technique, the condensate wave function (order... Title of program: bose.x Catalogue Id: ADWZ_v1_0 Nature of problem It is widely believed that the static properties of dilute Bose condensates, as obtained in atomic traps, can be described to a fairly good accuracy by the time-independent Gross-Pitaevskii equation. This program presents an efficient approach to solving this equation. Versions of this program held in the CPC repository in Mendeley Data ADWZ_v1_0; bose.x; 10.1016/j.cpc.2005.10.014 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)