Gaussian Time-Dependent Variational Principle for Bosons Contact Interaction in one dimension

We investigate the Dirac time-dependent variational method using a Gaussian trial functional for an infinite one dimensional system of Bosons interacting through a repulsive contact interaction. The method produces a set of non-linear time dependent equations for the variational parameters. By solvi...

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Bibliographic Details
Published inarXiv.org
Main Authors Kerman, Arthur K, Tommasini, Paolo
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 30.07.1997
Subjects
Bosons
Ground state
Nonlinear equations
Time dependence
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Summary:We investigate the Dirac time-dependent variational method using a Gaussian trial functional for an infinite one dimensional system of Bosons interacting through a repulsive contact interaction. The method produces a set of non-linear time dependent equations for the variational parameters. By solving the static equations we have calculated the ground state energy per particle. We have also considered small oscillations about equilibrium and obtain mode equations which lead us to a gapless dispersion relation. The existence of an exact numerical solution for the ground state energy and excitations obtained by Lieb allow us to compare with the Gaussian results. We can also, as the system becomes less dilute, see the improvement of the results as compared with the Bogoliubov scheme.
ISSN:2331-8422
DOI:10.48550/arxiv.9707318