Self-gravitating Bose-Einstein condensates and the Thomas-Fermi approximation
Abstract
Self-gravitating Bose-Einstein condensates (BEC) have been proposed in various astrophysical contexts, including Bose-stars and BEC dark matter halos. These systems are described by a combination of the Gross-Pitaevskii and Poisson equations (the GPP system). In the analysis of these hypothetical objects, the Thomas-Fermi (TF) approximation is widely used. This approximation is based on the assumption that in the presence of a large number of particles, the kinetic term in the Gross-Pitaevskii energy functional can be neglected, yet it is well known that this assumption is violated near the condensate surface. We also show that the total energy of the self-gravitating condensate in the TF-approximation is positive. The stability of a self-gravitating system is dependent on the total energy being negative. Therefore, the TF-approximation is ill suited to formulate initial conditions in numerical simulations. As an alternative, we offer an approximate solution of the full GPP system.
Cite
@article{arxiv.1402.0600,
title = {Self-gravitating Bose-Einstein condensates and the Thomas-Fermi approximation},
author = {Viktor T. Toth},
journal= {arXiv preprint arXiv:1402.0600},
year = {2016}
}
Comments
8 pages, 2 figures. Updated manuscript to match published version