A unified TDiff invariant field theory for the dark sector

Abstract

In this work we present a unified model for the cosmological dark sector. The theory is based on a simple minimally coupled scalar field whose action only contains a canonical kinetic term and is invariant under transverse diffeomorphisms (TDiff). The model has the same number of free parameters as $\Lambda$CDM. We confront the predictions of the model at the background level with data from Planck 2018 CMB distance priors, Pantheon+ and SH0ES SNIa distance moduli, BAO data points from 6dFGS, BOSS, eBOSS and DES and measurements of the Hubble parameter from cosmic chronometers. The model provides excellent results in the joint fit analysis, showing very strong evidence compared to $\Lambda$CDM in the deviance information criterion (DIC). We also show that the Hubble tension between Planck 2018 and SH0ES measurements can be alleviated in the unified TDiff model although further analysis is still needed.

arXiv comment17 pages, 8 figures. Final version published in PRD

References in corpus (28)

• The Confrontation between General Relativity and Experiment
• An alternative to quintessence
• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• In the Realm of the Hubble tension $-$ a Review of Solutions
• The Pantheon+ Analysis: Cosmological Constraints
• Constraints on the redshift dependence of the dark energy potential
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Cosmic Chronometers: Constraining the Equation of State of Dark Energy. I: H(z) Measurements
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
• Small Scale Cosmological Perturbations: An Analytic Approach
• Age-dating Luminous Red Galaxies observed with the Southern African Large Telescope
• Purely kinetic k-essence as unified dark matter
• The end of unified dark matter?
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Baryon acoustic oscillations with Lyman-$\alpha$ forests
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: BAO and RSD measurements from anisotropic clustering analysis of the Quasar Sample in configuration space between redshift 0.8 and 2.2
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the BAO and growth rate of structure of the luminous red galaxy sample from the anisotropic correlation function between redshifts 0.6 and 1
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: measurement of the BAO and growth rate of structure of the luminous red galaxy sample from the anisotropic power spectrum between redshifts 0.6 and 1.0
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: BAO and RSD measurements from the anisotropic power spectrum of the Quasar sample between redshift 0.8 and 2.2
• Setting the Stage for Cosmic Chronometers. II. Impact of Stellar Population Synthesis Models Systematics and Full Covariance Matrix
• On the Trace-Free Einstein Equations as a Viable Alternative to General Relativity
• Toward a Better Understanding of Cosmic Chronometers: A new measurement of H(z) at z~0.7
• Cosmological model with viscosity media (dark fluid) described by an effective equation of state
• No evidence for extensions to the standard cosmological model
• Low Redshift Baryon Acoustic Oscillation Measurement from the Reconstructed 6-degree Field Galaxy Survey
• Can late-time extensions solve the $H_0$ and ${\sigma }_8$ tensions?
• To conserve, or not to conserve: A review of nonconservative theories of gravity
• Ruling Out New Physics at Low Redshift as a solution to the $H_0$ Tension
• Transverse gravity versus observations

Cited by in corpus (8)

• Dark energy with a shift-symmetric scalar field: obstacles, loophole hunting and dead ends
• TDiff invariant gauge fields in cosmology
• Multi-field TDiff theories for cosmology
• A new parametrization of Hubble function and Hubble tension
• Inflation in theories with broken diffeomorphisms
• Multifield theories invariant under transverse diffeomorphisms: The mixed regime case
• K-nonizing
• $\Lambda$CDM from broken diffeomorphisms