2002/06/10 by Golam Mortuza Hossain, Hossain, Golam Mortuza, Parthasarathi Majumdar +1
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th) #astro-ph #gr-qc #hep-th
paper · pdf · doi:10.48550/arxiv.gr-qc/0206026
5 pages Revtex, 2 eps figures, a reference and a comment added
arxiv created 2002/06/12 · arxiv updated 2009/11/30
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 Ωm0 < 0.23 - a value \it not in agreement with recent measurements.