Viscous Ricci Dark Energy

Details Viscous Ricci Dark Energy Viscous Ricci Dark Energy

2009-05-05

arxiv.org/abs/0905.0527v1

Phys.Lett.B680:355-358,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 3 figures

Scientific paper

10.1016/j.physletb.2009.09.013

We investigate the viscous Ricci dark energy (RDE) model by assuming that there is bulk viscosity in the linear barotropic fluid and the RDE. In the RDE model without bulk viscosity, the universe is younger than some old objects at some redshifts. Since the age of the universe should be longer than any objects in the universe, the RDE model suffers the age problem, especially when we consider the object APM 08279+5255 at $z=3.91$, whose age is $t = 2.1$ Gyr. In this letter, we find that once the viscosity is taken into account, this age problem is alleviated.

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