A Better Way to Reconstruct Dark Energy Models ?

Details A Better Way to Reconstruct Dark Energy Models ? A Better Way to Reconstruct Dark Energy Models ?

2008-08-19

arxiv.org/abs/0808.2574v1

Astrophys.Space Sci.318:109-115,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

17 pages, 5 figures Accepted for publication in `Astrophysics and Space Science'

Scientific paper

10.1007/s10509-008-9892-6

To reconstruct dark energy models the redshift $z_{eq}$, marking the end of radiation era and the beginning of matter-dominated era, can play a role as important as $z_{t}$, the redshift at which deceleration parameter experiences a signature flip. To implement the idea we propose a variable equation of state for matter that can bring a smooth transition from radiation to matter-dominated era in a single model. A popular $\Lambda \propto \rho$ dark energy model is chosen for demonstration but found to be unacceptable. An alternative $\Lambda \propto \rho a^{3}$ model is proposed and found to be more close to observation.

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