Dynamical dark energy: scalar fields and running vacuum

Abstract

Recent analyses in the literature suggest that the concordance $\Lambda$CDM model with rigid cosmological term, $\Lambda =$const., may not be the best description of the cosmic acceleration. The class of "running vacuum models", in which $\Lambda =\Lambda (H)$ evolves with the Hubble rate, has been shown to fit the string of $SNIa+BAO+H(z)+LSS+CMB$ data significantly better than the $\Lambda$CDM. Here we provide further evidence on the time-evolving nature of the dark energy (DE) by fitting the same cosmological data in terms of scalar fields. As a representative model we use the original Peebles & Ratra potential, $V\propto {\Phi }^{-\alpha }$. We find clear signs of dynamical DE at $\sim 4\sigma$ c.l., thus reconfirming through a nontrivial scalar field approach the strong hints formerly found with other models and parametrizations.

Published in Mod. Phys. Lett. A32, No. 9 (2017) 1750054 (DOI: 10.1142/S0217732317500547)

References in corpus (17)

• Dynamics of dark energy
• Cosmology and the Fate of Dilatation Symmetry
• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
• The trouble with $H_0$
• A test of the nature of cosmic acceleration using galaxy redshift distortions
• Hubble parameter measurement constraints on the redshift of the deceleration-acceleration transition, dynamical dark energy, and space curvature
• Dark energy: a quantum fossil from the inflationary Universe?
• Dynamical vacuum energy in the expanding Universe confronted with observations: a dedicated study
• LXCDM: a cosmon model solution to the cosmological coincidence problem?
• Growth rate of cosmological perturbations at z ~ 0.1 from a new observational test
• The $\bar{\Lambda }CDM$ cosmology: from inflation to dark energy through running $\Lambda$
• Vacuum models with a linear and a quadratic term in H: structure formation and number counts analysis
• Cosmological constant vis-a-vis dynamical vacuum: bold challenging the $\Lambda$CDM
• Is there a concordance value for $H_0$?
• Growth Rate in the Dynamical Dark Energy Models

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