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Dark energy coupling with electromagnetism as seen from future low-medium redshift probes

Calabrese, Erminia, Martinelli, M., Pandolfi, S., Cardone, V.F., Martins, C.J.A.P., Spiro, S. and Vielzeuf, P.E. 2014. Dark energy coupling with electromagnetism as seen from future low-medium redshift probes. Physical Review D 89 (8) , 083509. 10.1103/PhysRevD.89.083509

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Abstract

Beyond the standard cosmological model the late-time accelerated expansion of the Universe can be reproduced by the introduction of an additional dynamical scalar field. In this case, the field is expected to be naturally coupled to the rest of the theory’s fields, unless a (still unknown) symmetry suppresses this coupling. Therefore, this would possibly lead to some observational consequences, such as space-time variations of nature’s fundamental constants. In this paper we investigate the coupling between a dynamical dark energy model and the electromagnetic field, and the corresponding evolution of the fine structure constant (α) with respect to the standard local value α0. In particular, we derive joint constraints on two dynamical dark energy model parametrizations (the Chevallier-Polarski-Linder and early dark energy model) and on the coupling with electromagnetism ζ, forecasting future low-medium redshift observations. We combine supernovae and weak lensing measurements from the Euclid experiment with high-resolution spectroscopy measurements of fundamental couplings and the redshift drift from the European Extremely Large Telescope, highlighting the contribution of each probe. Moreover, we also consider the case where the field driving the α evolution is not the one responsible for cosmic acceleration and investigate how future observations can constrain this scenario.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Physical Society
ISSN: 15507998
Date of First Compliant Deposit: 7 September 2017
Date of Acceptance: 1 January 2014
Last Modified: 20 Feb 2019 12:56
URI: http://orca.cf.ac.uk/id/eprint/104440

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