RT Journal Article
T1 Dark energy in vector-tensor theories of gravity
A1 López Maroto, Antonio
A1 Beltrán Jiménez, José
AB We consider a general class of vector-tensor theories of gravity and show that solutions with accelerated expansion and a future type III singularity are a common feature in these models. We also show that there are only six vector tensor theories with the same small scales behaviour as General Relativity and, in addition, only two of them can be made completely free from instabilities. Finally, two particular models as candidates for dark energy are proposed: on one hand, a cosmic vector that allows to alleviate the usual naturalness and coincidence problems and, on the other hand, the electromagnetic field is shown to give rise to an effective cosmological constant on large scales whose value can be explained in terms of inflation at the electroweak scale.
PB Iop Publishing Ltd
SN 1742-6588
YR 2010
FD 2010
LK https://hdl.handle.net/20.500.14352/44297
UL https://hdl.handle.net/20.500.14352/44297
LA eng
NO © 2010 IOP Publishing Ltd.This work has been supported by Ministerio de Ciencia e Innovación (Spain) project numbers FIS 2008-01323 and FPA 2008-00592, UCM-Santander PR34/07-15875, CAM/UCM 910309 and MEC grant BES- 2006-12059.Spanish Relativity Meeting (2009. Bilbao,España)
NO Ministerio de Ciencia e Innovación (Spain)
NO UCM-Santander
NO CAM/UCM
NO MEC
DS Docta Complutense
RD 25 abr 2025