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.

17 pages, 8 figures. Final version published in PRD

References in corpus (12)

• The Confrontation between General Relativity and Experiment
• 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
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
• 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: 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
• Toward a Better Understanding of Cosmic Chronometers: A new measurement of H(z) at z~0.7
• 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

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• 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