Quantum Gravity inspired nonlocal gravity model

TL;DR

This paper proposes a nonlocal gravity model inspired by quantum gravity, which modifies general relativity in the infrared regime and can produce a viable late-time cosmology consistent with observations and local tests.

Contribution

It introduces a novel IR-modified nonlocal gravity model motivated by nonperturbative quantum gravity studies, demonstrating its viability for cosmology.

Findings

The model can reproduce observed late-time cosmic acceleration.

It remains consistent with local gravity tests.

The model incorporates strong IR effects from quantum gravity insights.

Abstract

We consider a nonlocal gravity model motivated by nonperturbative Quantum Gravity studies. This model, if correct, suggests the existence of strong IR relevant effects which can lead to an interesting late time cosmology. We implement the IR modification directly in the effective action. We show that, upon some assumptions on initial conditions, this model describes an observationally viable background cosmology being also consistent with local gravity tests.