More about the Tolman-Oppenheimer-Volkoff equations for the generalized Chaplygin gas
Abstract
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. DPRVDAQ1550-7998 78, 064064 (2008)10.1103/PhysRevD.78.064064]. 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 α>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 Λ, affects the results found so far.
- Publication:
-
Physical Review D
- Pub Date:
- November 2009
- DOI:
- 10.1103/PhysRevD.80.104038
- arXiv:
- arXiv:0909.0866
- Bibcode:
- 2009PhRvD..80j4038G
- Keywords:
-
- 04.20.Gz;
- 04.20.Jb;
- 98.80.Es;
- Spacetime topology causal structure spinor structure;
- Exact solutions;
- Observational cosmology;
- General Relativity and Quantum Cosmology;
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- High Energy Physics - Theory
- E-Print:
- 8 pages, revtex style, minor stylistic changes, typos corrected. It matches the published version