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

Journal Article · Sun Nov 15 00:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.104038· OSTI ID:21313389

Gorini, V; Moschella, U; Piattella, O F ^[1]; Kamenshchik, A Yu ^[2]; Starobinsky, A A ^[3]

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1. Dipartimento di Fisica e Matematica, Universita dell'Insubria, Via Valleggio 11, 22100 Como, Italy and INFN, sezione di Milano, Via Celoria 16, 20133 Milano (Italy)
2. Dipartimento di Fisica and INFN, Via Irnerio 46, 40126 Bologna (Italy)
3. L. D. Landau Institute for Theoretical Physics, Kosygin Street 2, 119334 Moscow (Russian Federation)

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 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.

• OSTI ID: 21313389
• Journal Information: Physical Review. D, Particles Fields, Vol. 80, Issue 10; Other Information: DOI: 10.1103/PhysRevD.80.104038; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CAUSALITY
DENSITY
EQUATIONS OF STATE
MODIFICATIONS
PHANTOMS
VELOCITY