Regular Article - Theoretical Physics
Tests of standard cosmology in Hořava gravity, Bayesian evidence for a closed universe, and the Hubble tension
National Centre for Nuclear Research, Pasteura 7, 00-293, Warsaw, Poland
2 Center for Quantum Spacetime, Sogang University, 121-742, Seoul, Korea
Accepted: 23 September 2022
Published online: 5 October 2022
We consider some background tests of standard cosmology in the context of Hořava gravity with different scaling dimensions for space and time, which has been proposed as a renormalizable, higher-derivative, Lorentz-violating quantum gravity model without ghost problems. We obtain the “very strong” and “strong” Bayesian evidences for our two cosmology models A and B, respectively, depending on the choice of parametrization based on Hořava gravity, against the standard, spatially-flat, LCDM cosmology model based on general relativity. An MCMC analysis with the observational data, including BAO, shows (a) preference of a closed universe with the curvature density parameter , , (b) reduction of the Hubble tension with the Hubble constant , for the models A, B, respectively, and also (c) a positive result on the discordance problem. We comment on some possible further improvements for the “cosmic-tension problem” by considering the more complete early-universe physics, based on the Lorentz-violating standard model with anisotropic space-time scaling, consistently with Hořava gravity, as well as the observational data which are properly adopted for the closed universe.
© The Author(s) 2022
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