Dark energy and cosmic magnetic fields: electromagnetic relics from inflation



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López Maroto, Antonio and Beltrán Jiménez, José (2011) Dark energy and cosmic magnetic fields: electromagnetic relics from inflation. In Cosmology, quantum vacuum and zeta functions: in honor of Emilio Elizalde. Springer Proceedings in Physics (137). Springer-Verlag Berlin, pp. 215-225. ISBN 978-3-642-19759-8

Official URL: http://dx.doi.org/10.1007/978-3-642-19760-4_20


We consider an extended electromagnetic theory in which the scalar state which is usually eliminated be means of the Lorenz condition is allowed to propagate. On super-Hubble scales, such a state is given by the temporal component of the electromagnetic potential and contributes as an effective cosmological constant to the energy-momentum tensor. Its initial amplitude is set by quantum fluctuations generated during inflation and it is shown that the predicted value for the cosmological constant agrees with observations provided inflation took place at the electroweak scale. We also consider more general theories including non-minimal couplings to the space-time curvature in the presence of the temporal electromagnetic background. We show that both in the minimal and non minimal cases, the modified Maxwell's equations include new effective current terms which can generate magnetic fields from sub-galactic scales up to the present Hubble horizon. The corresponding amplitudes could be enough to seed a galactic dynamo or even to account for observations just by collapse and differential rotation in the protogalactic cloud.

Item Type:Book Section
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© 2011.
Conference on Cosmology, Quantum Vacuum Fluctuations and Zeta Functions (2010. Barcelona, España)

Uncontrolled Keywords:Universe, Origin
Subjects:Sciences > Physics
ID Code:26112
Deposited On:07 Jul 2014 17:22
Last Modified:07 Jul 2014 17:22

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