CMB acoustic scale in the entropic-like accelerating universe

Details CMB acoustic scale in the entropic-like accelerating universe CMB acoustic scale in the entropic-like accelerating universe

2010-05-05

arxiv.org/abs/1005.0790v2

Phys.Rev.D84:023503,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages, 2 figures. Accepted for publication in Physical Review D

Scientific paper

10.1103/PhysRevD.84.023503

We consider generalizations of the entropic accelerating universe recently proposed in Ref. [4,5] and show that their background equations can be made equivalent to a model with a dark energy component with constant parameter of state $w_{X} = -1 + 2\, \gamma /3$, where $\gamma$ is related to the coefficients of the new terms in the Friedman equations. After discussing all the Friedman equations for an arbitrary $\gamma$, we show how to recover the standard scalings for dust and radiation. The acoustic scale $\ell_A$, related to the peak positions in the pattern of the angular power spectrum of the Cosmic Microwave Background anisotropies, is also computed and yields the stringent bound $|\gamma|\ll 1$. We then argue that future data might be able to distinguish this model from pure $\Lambda$CDM (corresponding to $\gamma=0$).

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