Non-local cosmological models

TL;DR

This paper investigates non-local cosmological models inspired by infrared gravity, demonstrating that while inflationary solutions are common, transitioning to the radiation-dominated era is generally not feasible.

Contribution

It provides a detailed analysis of background cosmology in non-local models and highlights the limitations in achieving a successful exit from inflation.

Findings

Inflationary solutions are possible in all studied models.

Most models do not allow exit from inflation to the radiation-dominated era.

Non-local models can replicate inflationary behavior but face challenges in subsequent evolution.

Abstract

Nonlocal cosmological models are studied extensively in recent times because of their interesting cosmological consequences. In this paper, we have analyzed background cosmology on a class of non-local models which are motivated by the perturbative nature of gravity at infrared scale. We show that inflationary solutions are possible in all constructed non-local models. However, exit from inflation to RD era is not possible in most of the models.