Phenomenological equation of state and late-time cosmic acceleration

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Assuming a flat Friedmann-Robertson-Walker cosmology with a single perfect fluid, we propose a pressure-density ratio that evolves as a specific universal function of the scale parameter. We show that such a ratio can indeed be consistent with several observational constraints including those pertaining to late-time accelerated expansion. Generic dynamical scalar field models of Dark energy (with quadratic kinetic terms in their Lagrange density) are shown to be in accord with the proposed equation-of-state ratio, provided the current matter density parameter $Ω_{m0} < 0.23$ - a value {\it not} in agreement with recent measurements.
5 pages Revtex, 2 eps figures, a reference and a comment added

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General Relativity and Quantum Cosmology, Astrophysics, High Energy Physics - Theory

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http://salesiana.dossiersoluciones.com/handle/123456789/34244

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/gr-qc/0206026
 http://arxiv.org/abs/gr-qc/0206026

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arXiv