A generalized equation of state for dark energy

Abstract

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.

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

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