Does the Hubble constant tension call for new physics?

By E. Mörtsell, S. Dhawan. Journal of Cosmology and Astroparticle Physics, 2018

268 citations recorded by the source corpus.

The Λ Cold Dark Matter model (ΛCDM) represents the current standard model in cosmology. Within this, there is a tension between the value of the Hubble constant, H0, inferred from local distance indicators and the angular scale of fluctuations in the Cosmic Microwave Background (CMB). In terms of Bayseian evidence, we investigate whether the tension is significant enough to warrant new physics in the form of modifying or adding energy components to the standard cosmological model. We find that late time dark energy explanations are not favoured by data whereas a pre-CMB decoupling extra dark energy component has a positive, although not substantial, Bayesian evidence. A constant equation of state of the additional early energy density is constrained to 0.086+0.04−0.03. Although this value deviates significantly from 1/3, valid for dark radiation, the latter is favoured based on the Bayesian evidence. If the tension persists, future estimates of H0 at the 1% level will be able to decisively determine which of the proposed explanations is favoured.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/e591dcbf69d84def1cd1d83d11a951878ba46636

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Citations in the corpus

On the Hubble Constant Tension in the SNe Ia Pantheon Sample (2021, background): “…for dark energy, dependent on redshift, =w w z( ), with a wide range of theories (Armendariz-Picon et al. 2000; Zimdahl et al. 2001; Moffat 2005; Grande et al. 2006; Caldera-Cabral et al. 2009; Yoo & Watanabe 2012; Benisty & Guendelman 2018; Mörtsell & Dhawan 2018; Anagnostopoulos et al. 2019).”
Nonminimal dark sector physics and cosmological tensions (2019, background): “[45–119] for an incomplete list of recent papers).”
Cosmology Intertwined II: The Hubble Constant Tension (2020, unknown): “[84] E.”
Implications of an extended dark energy cosmology with massive neutrinos for cosmological tensions (2018, background): “[22] Edvard Mrtsell and Suhail Dhawan, “Does the Hubble constant tension call for new physics?” (2018), arXiv:1801.”
New physics in light of the H0 tension: An alternative view (2019, background): “While the examples I have considered are limited, they appear to point to a perhaps unexpected fact: from the statistical point of view the H0 tension does not seem to favour extensions to ΛCDM (a similar conclusion was already reached, through a different approach, in [248, 249]), but would rather ”
Early Dark Energy can Resolve the Hubble Tension. (2018, background): “[36] Edvard Mörtsell and Suhail Dhawan, “Does the Hubble”
Interacting scenarios with dynamical dark energy: Observational constraints and alleviation of the H0 tension (2019, background): “Finally, interacting scenarios prove to be efficient in alleviating the two known tensions of modern cosmology, namely the H0 one [67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95], and the σ8 one [90, 96, 97, 98].”
A buyer’s guide to the Hubble constant (2021, unknown): “Our preference here is to review selected models in broad classes that we hope will be informative, and readers are referred to extensive reviews by Mörtsell and Dhawan (2018), Knox and Millea (2020), Di Valentino et al. (2021), and Vagnozzi (2020) if they would like more detail.”