A generalized equation of state for dark energy

Details A generalized equation of state for dark energy A generalized equation of state for dark energy

2009-05-25

arxiv.org/abs/0905.4052v2

Phys.Rev.D80:043521,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 4 figures, Accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.80.043521

A generalized parameterization $w_\beta(z)$ for the dark energy equation of state (EoS) is proposed and some of its cosmological consequences are investigated. We show that in the limit of the characteristic dimensionless parameter $\beta \to +1, 0$ and -1 some well-known EoS parameterizations are fully recovered whereas for other values of $\beta$ the proposed parameterization admits a wider and new range of cosmological solutions. We also discuss possible constraints on the $w_\beta(z)$ parameters from current observational data.

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