Avoiding the dark energy coincidence problem with a cosmic vector

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Beltrán Jiménez, José and López Maroto, Antonio (2009) Avoiding the dark energy coincidence problem with a cosmic vector. AIP conference proceedings: avoiding the dark energy coincidence problem with a cosmic vector, 1122 . pp. 107-114. ISSN 0094-243x

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Official URL: http://dx.doi.org/10.1063/1.3141226




Abstract

We show that vector theories on cosmological scales are excellent candidates for dark energy. We consider two different examples, both are theories with no dimensional parameters nor potential terms, with natural initial conditions in the early universe and the same number of free parameters as ACDM. The first one exhibits scaling behaviour during radiation and a strong phantom phase today, ending in a "big-freeze" singularity. This model provides the best fit to date for the SNIa Gold dataset. The second theory we consider is standard electromagnetism. We show that a temporal electromagnetic field on cosmological scales generates an effective cosmological constant and that primordial electromagnetic quantum fluctuations produced during electroweak scale inflation coidd naturally explain, not only the presence of this field, but also the measured value of the dark energy density. The theory is compatible with all the local gravity tests, and is free from classical or quantum instabilities. Thus, not only the true nature of dark energy coidd be estabUshed without resorting to new physics, but also the value of the cosmological constant would find a natural explanation in the context of standard inflationary cosmology.


Item Type:Article
Additional Information:

© 2009 American Institute of Physics. Spanish Relativity Conference (31st. 2008. Salamanca, Spain). This work has been supported by DGICYT (Spain) project numbers FPA 2004-02602 and FPA 2005-02327, UCM-Santander PR34/07-15875 and by CAM/UCM 910309. J.B. aknowledges support from MFC grant BFS-2006-12059.

Uncontrolled Keywords:Space
Subjects:Sciences > Physics > Physics-Mathematical models
ID Code:43080
Deposited On:11 Jul 2017 08:37
Last Modified:11 Jul 2017 10:34

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