Time Variable Cosmological Constant from Renormalization Group Equations

Details Time Variable Cosmological Constant from Renormalization Group Equations Time Variable Cosmological Constant from Renormalization Group Equations

2009-06-05

arxiv.org/abs/0906.1113v3

Mod.Phys.Lett.A25:377-388,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 4 figures. the case \mu^2=-\dot{H} and data from CMB shift parameter R are added

Scientific paper

10.1142/S0217732310031762

In this paper, a time variable cosmological constant (CC) from renormalization group equations (RGEs) is explored, where the renormalization scale $\mu^2=R^{-2}_{CC}=Max(\dot{H}+2H^2,-\dot{H})$ is taken. The cosmological parameters, such as dimensionless energy density, deceleration parameter and effective equation of state of CC etc, are derived. Also, the cosmic observational constraints are implemented to test the model's consistence. The results show that it is compatible with cosmic data. So, it would be a viable dark energy model.

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