More about the Tolman-Oppenheimer-Volkoff equations for the generalized Chaplygin gas

Details More about the Tolman-Oppenheimer-Volkoff equations for the generalized Chaplygin gas More about the Tolman-Oppenheimer-Volkoff equations for the generalized Chaplygin gas

2009-09-04

arxiv.org/abs/0909.0866v3

Phys. Rev. D 80, 104038 (2009)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, revtex style, minor stylistic changes, typos corrected. It matches the published version

Scientific paper

10.1103/PhysRevD.80.104038

We investigate the Tolman-Oppenheimer-Volkoff equations for the generalized Chaplygin gas with the aim of extending the findings of V. Gorini, U. Moschella, A. Y. Kamenshchik, V. Pasquier, and A. A. Starobinsky [Phys. Rev. D {\bf 78}, 064064 (2008)]. We study both the standard case, where we reproduce some previous results, and the phantom case. In the phantom case we show that even a superluminal group velocity arising for $\alpha > 1$ cannot prevent the divergence of the pressure at a finite radial distance. Finally, we investigate how a modification of the generalized Chaplygin gas equation of state, required by causality arguments at densities very close to $\Lambda$, affects the results found so far.

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