Self-Gravitating Bose-Einstein Condensates and the Thomas-Fermi Approximation
AbstractSelf-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. View Full-Text
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Toth, V.T. Self-Gravitating Bose-Einstein Condensates and the Thomas-Fermi Approximation. Galaxies 2016, 4, 9.
Toth VT. Self-Gravitating Bose-Einstein Condensates and the Thomas-Fermi Approximation. Galaxies. 2016; 4(3):9.Chicago/Turabian Style
Toth, Viktor T. 2016. "Self-Gravitating Bose-Einstein Condensates and the Thomas-Fermi Approximation." Galaxies 4, no. 3: 9.
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