Non-local gravity in bouncing cosmology scenarios

TL;DR

This paper investigates non-local gravity modifications in bouncing cosmologies to avoid the initial singularity, developing numerical solutions and analyzing the evolution of the distortion function across different bounce models.

Contribution

It introduces a numerical reconstruction of the non-local distortion function in various bouncing universe scenarios, demonstrating their viable cosmological solutions.

Findings

Viable solutions for non-local gravity in bouncing cosmologies

Evolution of the distortion function across bounce points

Applicability to multiple bouncing universe models

Abstract

In this work, we analyzed the improved Deser-Woodard non-local gravity over the background of five different bouncing cosmologies, whose premise is avoid the initial singular state of the universe. We developed the numerical solution for the non-local distortion function, which encompass the modifications to the Einstein-Hilbert action, using the reconstruction procedure and we have found that they have a viable cosmological solution. Afterwards, we discussed the physical aspects and outcomes of the evolution of the distortion function throughout the bouncing point for these models, specifically: the symmetric bounce, oscillatory bounce, the matter bounce, finite time singularity model, and the pre-inflationary asymmetrical bounce.