Constraints on Late Time Violations of the Equivalence Principle in the Dark Sector

Abstract

If dark energy is dynamical due to the evolution of a scalar field, then in general it is expected that the scalar is coupled to matter. While couplings to the standard model particles are highly constrained by local experiments, bounds on couplings to dark matter (DM) are only obtained from cosmological observations and they are consequently weaker. It has recently been pointed out that the coupling itself can become non-zero only at the time of dark energy domination, due to the evolution of dark energy itself, leading to a violation of the equivalence principle (EP) in the dark sector at late times. In this paper we study a specific model and show that such late-time violations of the EP in the DM sector are not strongly constrained by the evolution of the cosmological background and by observables in the linear regime (e.g. from the cosmic microwave background radiation). A study of perturbations in non-linear regime is necessary to constrain late--time violations of the equivalence principle much more strongly.

arXiv comment8 pages, 4 figures, 2 tables. Typos corrected, references added. Comparison to model in which initial field value sits at the minimum has been added. Version to be submitted to journal

References in corpus (34)

• Cosmological Imprint of an Energy Component with General Equation of State
• Cosmological Constant - the Weight of the Vacuum
• 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
• Cosmology and the Fate of Dilatation Symmetry
• The 6dF Galaxy Survey: Baryon Acoustic Oscillations and the Local Hubble Constant
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• In the Realm of the Hubble tension $-$ a Review of Solutions
• Coupled Quintessence
• The Clustering of the SDSS DR7 Main Galaxy Sample I: A 4 per cent Distance Measure at z=0.15
• The String Dilaton and a Least Coupling Principle
• A 6% measurement of the Hubble parameter at $z\sim 0.45$: direct evidence of the epoch of cosmic re-acceleration
• Quintessence and the Rest of the World
• Planck 2018 results. V. CMB power spectra and likelihoods
• Early Dark Energy Can Resolve The Hubble Tension
• Everything You Always Wanted To Know About The Cosmological Constant Problem (But Were Afraid To Ask)
• The Swampland: Introduction and Review
• Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code
• On the Cosmological Implications of the String Swampland
• The Cosmic Linear Anisotropy Solving System (CLASS) I: Overview
• Interacting Dark Matter and Dark Energy
• The $H_0$ Olympics: A fair ranking of proposed models
• Linear and non-linear perturbations in dark energy models
• The Dilaton and Modified Gravity
• Early modified gravity in light of the $H_0$ tension and LSS data
• Tidal Tails Test the Equivalence Principle in the Dark Sector
• Internal Robustness of Growth Rate data
• Searching for dark matter - dark energy interactions: going beyond the conformal case
• $H_0$ Tension, Swampland Conjectures and the Epoch of Fading Dark Matter
• Runaway Quintessence, Out of the Swampland
• Unveiling dark fifth forces with linear cosmology
• Dark Energy, the Swampland and the Equivalence Principle
• Cosmological constraints on non-adiabatic dark energy perturbations
• The Swampland and Screened Modified Gravity

Cited by in corpus (3)

• Hubble tension as a window on the gravitation of the dark matter sector
• Hubble tension as a window on the gravitation of the dark matter sector: Exploration of a family of models
• On observational signatures of multi-fractional theory