Vector models for dark energy

Details Vector models for dark energy Vector models for dark energy

2008-07-16

arxiv.org/abs/0807.2528v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. Contribution to the proceedings of 43rd Rencontres de Moriond: Cosmology, La Thuile, Italy, 15-22 Mar 2008

Scientific paper

We explore the possibility that the present stage of accelerated expansion of the universe is due to the presence of a cosmic vector field. We show that vector theories allow for the generation of an accelerated phase without the introduction of potential terms or unnatural scales in the Lagrangian. We propose a particular model with the same number of parameters as LCDM and excellent fits to SNIa data. The model is scaling during radiation era, with natural initial conditions, thus avoiding the cosmic coincidence problem. Upcoming observations will be able to clearly discriminate it from standard LCDM cosmology

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