Stable analytic bounce in non-local Einstein-Gauss-Bonnet cosmology

TL;DR

This paper explores a non-local modified gravity model inspired by string theory, presenting exact bouncing cosmological solutions and demonstrating their stability during the bounce phase.

Contribution

It introduces a general quadratic curvature non-local action in Einstein-Gauss-Bonnet gravity, providing exact solutions and a perturbation framework for stability analysis.

Findings

Found exact bouncing solutions in non-local gravity

Demonstrated stability of the bounce during the phase

Developed techniques for analyzing similar models

Abstract

We consider the most general quadratic in curvature stringy motivated non-local action for the modified Einstein's gravity. We present exact analytic cosmological solutions including the bouncing ones and develop the relevant techniques for the further study of this type of models. We also elaborate on the perturbation formalism and argue that the found bouncing solution is stable during the bounce phase.