Age of the Universe in the Cardassian Model

Details Age of the Universe in the Cardassian Model Age of the Universe in the Cardassian Model

2004-03-09

arxiv.org/abs/astro-ph/0403196v3

JCAP 0510 (2005) 007

Astronomy and Astrophysics

Astrophysics

11 pages, two eps figures. v2: clarified choice of parameters, other minor changes. v3: added references, other changes to mat

Scientific paper

10.1088/1475-7516/2005/10/007

The age of the universe is obtained in a subset of Cardassian models by using WMAP data. Cardassian expansion is a modification to the Friedmann equation that allows the universe to be flat, matter dominated, and accelerating, without a vacuum component. Since this model changes the evolution of the universe, we should not a priori expect the Cardassian age to be the same as the WMAP Friedmann derived result of 13.7 +/- 0.2 Gyrs. However, in the subset of Cardassian models we consider, we discover that the age of the universe varies from 13.4 - 13.8 Gyr over the range of parameter space we explore, a result close to that of the standard Lambda Cold Dark Matter model. The Hubble constant h, which may also vary in these models, likewise varies little from the Friedmann result.

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