Local Limit of Nonlocal Gravity: A Teleparallel Extension of General Relativity

TL;DR

This paper develops a teleparallel extension of general relativity that incorporates nonlocal gravity effects, analyzes its cosmological implications, and suggests it can address the H_0 tension in cosmology.

Contribution

It introduces a local constitutive framework for nonlocal gravity within teleparallel gravity, extending TEGR and exploring its cosmological consequences.

Findings

Modified Cartesian flat model is inconsistent with positive cosmological constant

Model predicts different evolution of dark energy components

Potential to resolve the H_0 tension in cosmology

Abstract

We describe a general constitutive framework for a teleparallel extension of the general theory of relativity. This approach goes beyond the teleparallel equivalent of general relativity (TEGR) by broadening the analogy with the electrodynamics of media. In particular, the main purpose of this paper is to investigate in detail a local constitutive extension of TEGR that is the local limit of nonlocal gravity (NLG). Within this framework, we study the modified FLRW cosmological models. Of these, the most cogent turns out to be the modified Cartesian flat model which is shown to be inconsistent with the existence of a positive cosmological constant. Moreover, dynamic dark energy and other components of the modified Cartesian flat model evolve differently with the expansion of the universe as compared to the standard flat cosmological model. The observational consequences of the modified Cartesian flat model are briefly explored and it is shown that the model is capable of resolving the H_0 tension.