Phenomenological equation of state and late-time cosmic acceleration
| dc.creator | Hossain, Golam Mortuza | |
| dc.creator | Majumdar, Parthasarathi | |
| dc.date | 2002-06-10 | |
| dc.date | 2002-06-12 | |
| dc.date.accessioned | 2026-07-07T03:26:56Z | |
| dc.date.available | 2026-07-07T03:26:56Z | |
| dc.description | 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. | |
| dc.description | 5 pages Revtex, 2 eps figures, a reference and a comment added | |
| dc.identifier | https://arxiv.org/abs/gr-qc/0206026 | |
| dc.identifier | http://arxiv.org/abs/gr-qc/0206026 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/34244 | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | Astrophysics | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Phenomenological equation of state and late-time cosmic acceleration | |
| dc.type | text |