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H0 tension as a hint for a transition in gravitational theory

Khosravi, N ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevD.99.103526
  3. Publisher: American Physical Society , 2019
  4. Abstract:
  5. We propose a cosmological model, üΛCDM, based on "über gravity," which is a canonical ensemble average of many theories of gravity. In this model, we have a sharp transition from (a purely) ΛCDM era to a phase in which the Ricci scalar is a constant. This transition occurs when the Ricci scalar reaches a critical scale or alternatively a transition redshift, z. We use the observations of baryonic acoustic oscillations and supernovae Ia, as well as the cosmic microwave background data to constrain üΛCDM. This yields H0=70.6-1.3+1.1 km/s/Mpc, ωm=0.2861±0.0092, and z=0.537-0.375+0.277, providing a marginally better fit with a Akaike information criterion of 0.8. Therefore, üΛCDM can ease the H0 tension, albeit marginally, with one additional free parameter. We also provide a preliminary study of the linear perturbation theory in üΛCDM that points to interesting potential smoking guns in the observations of large scale structure at z
  6. Keywords:
  8. Source: Physical Review D ; Volume 99, Issue 10 , 2019 ; 24700010 (ISSN)
  9. URL: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.99.103526