Fundamental Physics with ESPRESSO, Constraining a simple parametrisation for varying $\alpha$

Abstract

The spectrograph ESPRESSO recently obtained a limit on the variation of the fine-structure constant, $\alpha$, through measurements along the line of sight of a bright quasar with a precision of $1.36$ ppm at $1\sigma$ level. This imposes new constraints on cosmological models with a varying $\alpha$. We assume such a model where the electromagnetic sector is coupled to a scalar field dark energy responsible for the current acceleration of the Universe. We parametrise the variation of $\alpha$ with two extra parameters, one defining the cosmological evolution of the quintessence component and the other fixing the coupling with the electromagnetic field. The objective of this work is to constrain these parameters with both astrophysical and local probes. We also carried out a comparative analysis of how each data probe may constrain our parametrisation. We performed a Bayesian analysis by comparing the predictions of the model with observations. The astrophysical datasets are composed of quasar spectra measurements, including the latest ESPRESSO data point, as well as Planck observations of the cosmic microwave background. We combined these with local results from atomic clocks and the MICROSCOPE experiment. The constraints placed on the quintessence parameter are consistent with a null variation of the field, and are therefore compatible with a $\Lambda$CDM cosmology. The constraints on the coupling to the electromagnetic sector are dominated by the Eötvös parameter local bound. More precise measurements with ESPRESSO will be extremely important to study the cosmological evolution of $\alpha$ as it probes an interval of redshift not accessible to other types of observations. However, for this particular model, current available data favour a null variation of $\alpha$ resulting mostly from the strong MICROSCOPE limits.

arXiv comment9 pages, 7 figures, as published in A&A

References in corpus (48)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• Exploring the Expansion History of the Universe
• Accelerating Universes with Scaling Dark Matter
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
• X-ray spectral modelling of the AGN obscuring region in the CDFS: Bayesian model selection and catalogue
• Quintessence and the Rest of the World
• Planck 2018 results. V. CMB power spectra and likelihoods
• Further Evidence for Cosmological Evolution of the Fine Structure Constant
• Varying constants, Gravitation and Cosmology
• Quintessence arising from exponential potentials
• ESPRESSO@VLT -- On-sky performance and first results
• Further evidence for a variable fine-structure constant from Keck/HIRES QSO absorption spectra
• Indications of a spatial variation of the fine structure constant
• Violations of the equivalence principle in a dilaton-runaway scenario
• Equivalence Principle Violations and Couplings of a Light Dilaton
• Spatial variation in the fine-structure constant -- new results from VLT/UVES
• Probing the cosmological variation of the fine-structure constant: Results based on VLT-UVES sample
• Improved limits for violations of local position invariance from atomic clock comparisons
• Changing alpha With Time: Implications For Fifth-Force-Type Experiments And Quintessence
• The status of varying constants: a review of the physics, searches and implications
• Constraining Variations in the Fine-Structure Constant with the Cosmic Microwave Background
• The UVES Large Program for Testing Fundamental Physics: I Bounds on a change in alpha towards quasar HE 2217-2818
• Impact of instrumental systematic errors on fine-structure constant measurements with quasar spectra
• Revision of VLT/UVES constraints on a varying fine-structure constant
• Models of quintessence coupled to the electromagnetic field and the cosmological evolution of alpha
• New constraints on time-dependent variations of fundamental constants using Planck data
• Comment on "Limits on the Time Variation of the Electromagnetic Fine-Structure Constant in the Low Energy Limit from Absorption Lines in the Spectra of Distant Quasars"
• Quintessence Cosmology and Varying $\alpha$
• Reconstructing the dark energy equation of state with varying alpha
• First measurement of Mg isotope abundances at high redshifts and accurate estimate of Delta alpha/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
• Fundamental physics with ESPRESSO: Precise limit on variations in the fine-structure constant towards the bright quasar HE 0515$-$4414
• Constraining the Variation of the Fine Structure Constant with Observations of Narrow Quasar Absorption Lines
• A new era of fine structure constant measurements at high redshift
• Precise limits on cosmological variability of the fine-structure constant with zinc and chromium quasar absorption lines
• Dark Energy coupling with electromagnetism as seen from future low-medium redshift probes
• Euclid: constraining dark energy coupled to electromagnetism using astrophysical and laboratory data
• A bound on the 12C/13C ratio in near-pristine gas with ESPRESSO
• A simple parametrisation for coupled dark energy
• Varying fine-structure constant cosmography
• Consistency of local and astrophysical tests of the stability of fundamental constants
• Fundamental physics with ESPRESSO: Constraints on Bekenstein and dark energy models from astrophysical and local probes

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