Early Dark Energy can Resolve the Hubble Tension.

By V. Poulin, Tristan L. Smith, Tanvi Karwal, M. Kamionkowski. Physical Review Letters, 2018

706 citations recorded by the source corpus.

Early dark energy (EDE) that behaves like a cosmological constant at early times (redshifts z≳3000) and then dilutes away like radiation or faster at later times can solve the Hubble tension. In these models, the sound horizon at decoupling is reduced resulting in a larger value of the Hubble parameter H_{0} inferred from the cosmic microwave background (CMB). We consider two physical models for this EDE, one involving an oscillating scalar field and another a slowly rolling field. We perform a detailed calculation of the evolution of perturbations in these models. A Markov Chain Monte Carlo search of the parameter space for the EDE parameters, in conjunction with the standard cosmological parameters, identifies regions in which H_{0} inferred from Planck CMB data agrees with the SH0ES local measurement. In these cosmologies, current baryon acoustic oscillation and supernova data are described as successfully as in the cold dark matter model with a cosmological constant, while the fit to Planck data is slightly improved. Future CMB and large-scale-structure surveys will further probe this scenario.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/34e9fe192f1e8ad778db180fef395bd363665278

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Citations in the corpus

New physics in light of the H0 tension: An alternative view (2019, background): “[60–209] for what is inevitably an incomplete list of works examining these possibilities.”
BOSS DR12 full-shape cosmology: ΛCDM constraints from the large-scale galaxy power spectrum and bispectrum monopole (2021, methodology): “In particular, we can obtain constraints on the neutrino mass using the above framework, sharpen bounds on Early Dark Energy [e.g. 24, 123], and place constraints on primordial non-Gaussianity (PNG).”
The Hubble tension in light of the Full-Shape analysis of Large-Scale Structure data (2020, methodology): “Keeping in mind that the relative amplitude of the CMB and BAO peaks fixes ωb, following for example [62, 95] we can Taylor expand eq.”
The Ups and Downs of Early Dark Energy solutions to the Hubble tension: A review of models, hints and constraints circa 2023 (2023, methodology): “The general behavior of this EDE component is well-described by cycle-averaging the evolution of the background and perturbative field dynamics [75, 116], as we describe in more detail in sec.”
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