Nonsingular Universes in Gauss-Bonnet Gravity's Rainbow

Understand

In this paper, we will study the rainbow deformation of the FRW cosmology in both Einstein gravity and Gauss-Bonnet gravity.

• We will demonstrate that the singularity in the FRW cosmology can be removed because of the rainbow deformation of the FRW metric.
• We will obtain the general constraints required for the FRW cosmology to be free from singularities.
• It will be observed that the inclusion of Gauss-Bonnet gravity can significantly change the constraints required to obtain a nonsingular universes.