• DOI:10.3390/galaxies4030009
• Corpus ID: 18270019

Self-Gravitating Bose-Einstein Condensates and the Thomas-Fermi Approximation

@article{Toth2014SelfGravitatingBC,
  title={Self-Gravitating Bose-Einstein Condensates and the Thomas-Fermi Approximation},
  author={V. Toth},
  journal={arXiv: General Relativity and Quantum Cosmology},
  year={2014},
  volume={4},
  pages={9}
}

• V. Toth
• Published 4 February 2014
• Physics
• arXiv: General Relativity and Quantum Cosmology

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.