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Cosmic vector for dark energy: Constraints from supernovae, cosmic microwave background, and baryon acoustic oscillations

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López Maroto, Antonio and Beltrán Jiménez, José and Lazkoz, Ruth (2009) Cosmic vector for dark energy: Constraints from supernovae, cosmic microwave background, and baryon acoustic oscillations. Physical Review D, 80 (2). ISSN 1550-7998

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Official URL: http://dx.doi.org/10.1103/PhysRevD.80.023004


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Abstract

It has been recently shown that the presence of a vector field over cosmological scales could explain the observed accelerated expansion of the Universe without introducing either new scales or unnatural initial conditions in the early Universe, thus avoiding the coincidence problem. Here, we present a detailed analysis of the constraints imposed by supernova type Ia (SNIa), cosmic microwave background (CMB), and baryon acoustic oscillation (BAO) data on the vector dark energy model with general spatial curvature. We find that contrary to standard cosmology, CMB data exclude a flat universe for this model and, in fact, predict a closed geometry for the spatial sections. We see that CMB and SNIa Gold data are perfectly compatible at the 1-sigma level, however the SNIa Union data set exhibits a 3-sigma tension with CMB. The same level of tension is also found between SNIa and BAO measurements.


Item Type:Article
Additional Information:

© 2009 The American Physical Society.
We would like to thank Eiichiro Komatsu for useful comments. J. B. is very grateful to the Department ofFisika Teorikoa of the EHU for their hospitality. This work has been supported by DGICYT (Spain) Project Nos. FPA 2004-02602 and FPA 2005-02327, UCMSantander PR34/07-15875, CAM/UCM 910309, and MEC grant BES-2006-12059.

Uncontrolled Keywords:Probe Wmap Observations, Equation-of-State, Cosmology, Constant, Lambda, Space
Subjects:Sciences > Physics
ID Code:26506
Deposited On:08 Aug 2014 11:29
Last Modified:08 Aug 2014 11:35

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