Distinguishing freezing and thawing dark energy models through measurements of the fine-structure constant

Abstract

Mapping the behaviour of dark energy is a pressing task for observational cosmology. Phenomenological classification divides dynamical dark energy models into freezing and thawing, depending on whether the dark energy equation of state is approaching or moving away from $w=p/\rho =-1$. Moreover, in realistic dynamical dark energy models the dynamical degree of freedom is expected to couple to the electromagnetic sector, leading to variations of the fine-structure constant $\alpha$. We discuss the feasibility of distinguishing between the freezing and thawing classes of models with current and forthcoming observational facilities and using a parametrisation of the dark energy equation of state, which can have either behaviour, introduced by Mukhanov as fiducial paradigm. We illustrate how freezing and thawing models lead to different redshift dependencies of $\alpha$, and use a combination of current astrophysical observations and local experiments to constrain this class of models, improving the constraints on the key coupling parameter by more than a factor of two, despite considering a more extended parameter space than the one used in previous studies. We also briefly discuss the improvements expected from future facilities and comment on the practical limitations of this class of parametrisations. In particular, we show that sufficiently sensitive data can distinguish between freezing and thawing models, at least if one assumes that the relevant parameter space does not include phantom dark energy models.

arXiv comment12 pages, 9 figures, 4 tables; A & A (in press)

References in corpus (46)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
• The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined Pantheon Sample
• Phantom Energy and Cosmic Doomsday
• The Hubble Space Telescope Cluster Supernova Survey: V. Improving the Dark Energy Constraints Above z>1 and Building an Early-Type-Hosted Supernova Sample
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Quintessence and the Rest of the World
• Varying constants, Gravitation and Cosmology
• The phantom menaced: constraints on low-energy effective ghosts
• Can dark energy evolve to the Phantom?
• Indications of a spatial variation of the fine structure constant
• The MICROSCOPE mission: first results of a space test of the Equivalence Principle
• Hubble parameter measurement constraints on the redshift of the deceleration-acceleration transition, dynamical dark energy, and space curvature
• A Simple Varying-alpha Cosmology
• Type Ia Supernova Distances at z > 1.5 from the Hubble Space Telescope Multi-Cycle Treasury Programs: The Early Expansion Rate
• Changing alpha With Time: Implications For Fifth-Force-Type Experiments And Quintessence
• Evolution of the Fine Structure Constant Driven by Dark Matter and the Cosmological Constant
• Quantum Cosmological Perturbations: Predictions and Observations
• The status of varying constants: a review of the physics, searches and implications
• Measuring Dark Energy Properties with Photometrically Classified Pan-STARRS Supernovae. II. Cosmological Parameters
• Natural Nuclear Reactor Oklo and Variation of Fundamental Constants Part 1: Computation of Neutronics of Fresh Core
• The UVES Large Program for Testing Fundamental Physics: I Bounds on a change in alpha towards quasar HE 2217-2818
• Phenomenology of the Equivalence Principle with Light Scalars
• Dynamical behavior of generic quintessence potentials: constraints on key dark energy observables
• Quintessence Cosmology and Varying $\alpha$
• Reconstructing the dark energy equation of state with varying alpha
• High-precision limit on variation in the fine-structure constant from a single quasar absorption system
• The UVES Large Program for testing fundamental physics - III. Constraints on the fine-structure constant from 3 telescopes
• Space test of the Equivalence Principle: first results of the MICROSCOPE mission
• Subaru Telescope limits on cosmological variations in the fine-structure constant
• Quintessence's Last Stand?
• Constraining the dark energy models with H(z) data: an approach independent of $H_0$
• Constraining Variations in the Fine Structure Constant in the presence of Early Dark Energy
• Quintessence in a quandary: prior dependence in dark energy models
• Fine-structure constant constraints on dark energy
• Fine-structure constant constraints on dark energy: II. Extending the parameter space
• Dark energy constraints from ESPRESSO tests of the stability of fundamental couplings
• Current and future constraints on extended Bekenstein-type models for a varying fine-structure constant
• Consistency of local and astrophysical tests of the stability of fundamental constants
• Current and future constraints on Bekenstein-type models for varying couplings
• Cosmological and astrophysical constraints on tachyon dark energy models
• Fisher matrix forecasts for astrophysical tests of the stability of the fine-structure constant
• Discerning Dark Energy Models with High-Redshift Standard Candles

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