A cosmic vector for dark energy

Details A cosmic vector for dark energy A cosmic vector for dark energy

2008-01-09

arxiv.org/abs/0801.1486v2

Phys.Rev.D78:063005,2008

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, 1 table. New comments and references included. Final version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.78.063005

In this work we show that the presence of a vector field on cosmological scales could explain the present phase of accelerated expansion of the universe. The proposed theory contains no dimensional parameters nor potential terms and does not require unnatural initial conditions in the early universe, thus avoiding the so called cosmic coincidence problem. In addition, it fits the data from high-redshift supernovae with excellent precision, making definite predictions for cosmological parameters. Upcoming observations will be able to clearly discriminate this model from standard cosmology with cosmological constant.

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