Parametrization of dark energy equation of state Revisited

Abstract

A comparative study of various parametrizations of the dark energy equation of state is made. Astrophysical constraints from LSS, CMB and BBN are laid down to test the physical viability and cosmological compatibility of these parametrizations. A critical evaluation of the 4-index parametrizations reveals that Hannestad-Mörtsell as well as Lee parametrizations are simple and transparent in probing the evolution of the dark energy during the expansion history of the universe and they satisfy the LSS, CMB and BBN constraints on the dark energy density parameter for the best fit values.

11 pages

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• Accelerating Universe: Observational Status and Theoretical Implications
• Thermodynamics of the Universe Filled with Perfect Fluid Having Variable Equation of State
• Cosmological Equation of State and Interacting Energies
• Probing modified gravitational-wave dispersion with bursts from eccentric black-hole binaries
• Dynamic of the accelerated expansion of the universe in the DGP model
• Dark energy model selection with current and future data