RT Journal Article
T1 Avoiding the dark energy coincidence problem with a cosmic vector
A1 Beltrán Jiménez, José
A1 López Maroto, Antonio
AB 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.
PB American Institute of Physics
SN 0094-243x
YR 2009
FD 2009
LK https://hdl.handle.net/20.500.14352/42672
UL https://hdl.handle.net/20.500.14352/42672
LA eng
NO © 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.
NO Ministerio de Educación y Ciencia (MEC)
NO Universidad Complutense de Madrid/Banco de Santander
NO Comunidad de Madrid/UCM
NO MFC
DS Docta Complutense
RD 28 abr 2024