Resolving Hubble tension with the Milne model

Abstract

The recent measurements of the Hubble constant based on the standard $\Lambda$CDM cosmology reveal an underlying disagreement between the early-Universe estimates and the late-time measurements. Moreover, as these measurements improve, the discrepancy not only persists but becomes even more significant and harder to ignore. The present situation places the standard cosmology in jeopardy and provides a tantalizing hint that the problem results from some new physics beyond the $\Lambda$CDM model. It is shown that a non-conventional theory - the Milne model - which introduces a different evolution dynamics for the Universe, alleviates the Hubble tension significantly. Moreover, the model also averts some long-standing problems of the standard cosmology, for instance, the problems related with the cosmological constant, the horizon, the flatness, the Big Bang singularity, the age of the Universe and the non-conservation of energy.

Received an Honorable Mention in the 2020 Essay Competition of the Gravity Research Foundation

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• Can a tensorial analogue of gravitational force explain away the galactic rotation curves without dark matter?
• Cosmic-time quantum mechanics and the passage-of-time problem