Abstract
Beyond the standard cosmological model where the late-time accelerated expansion of the universe is driven by a cosmological constant, the observed expansion can be reproduced as well 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.
Highlights
Since the discovery of cosmic acceleration from measurements of luminosity distances of type Ia Supernovae (SN) in 1998 [1,2] and its confirmation by several other independent cosmological data, the nature of the component driving this acceleration, the so-called dark energy (DE), has been deeply debated
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 this paper we focus on low-medium redshift observables, forecasting SN and QSO data, weak lensing shear power spectrum measurements (WL), and redshift-drift (RD) data. The relevance of this combination of probes is the coverage of a wide redshift range (0 < z ≲ 5), which is a very powerful way to discriminate between a cosmological constant and a dynamical DE model, as it makes it possible to investigate the onset of DE
Summary
Since the discovery of cosmic acceleration from measurements of luminosity distances of type Ia Supernovae (SN) in 1998 [1,2] and its confirmation by several other independent cosmological data, the nature of the component driving this acceleration, the so-called dark energy (DE), has been deeply debated. Alternative models for the DE, such as quintessence, are called (models of) dynamical dark energy and, even if not favored, they are currently not excluded by observations [3,4] Several of these alternative models are characterized by the existence of an additional scalar field which drives the accelerated expansion of the Universe. In this paper we focus on low-medium redshift observables, forecasting SN and QSO data, weak lensing shear power spectrum measurements (WL), and redshift-drift (RD) data The relevance of this combination of probes is the coverage of a wide redshift range (0 < z ≲ 5), which is a very powerful way to discriminate between a cosmological constant and a dynamical DE model, as it makes it possible to investigate the onset of DE.
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