Friedmann equations and cosmic bounce in a modified cosmological scenario
Abstract
In this work we present a derivation of modified Raychaudhuri and Friedmann equations from a phenomenological model of quantum gravity based on the thermodynamics of spacetime. Starting from general gravitational equations of motion which encode low-energy quantum gravity effects, we found its particular solution for homogenous and isotropic universes with standard matter content, obtaining a modified Raychaudhuri equation. Then, we imposed local energy conservation and used a perturbative treatment to derive a modified Friedmann equation. The modified evolution in the early universe we obtained suggests a replacement of the Big Bang singularity by a regular bounce. Lastly, we also briefly discuss the range of validity of the perturbative approach and its results.
Keywords
Cite
@article{arxiv.2212.10928,
title = {Friedmann equations and cosmic bounce in a modified cosmological scenario},
author = {Ana Alonso-Serrano and Marek Liška and Antonio Vicente-Becerril},
journal= {arXiv preprint arXiv:2212.10928},
year = {2023}
}
Comments
8 pages, 2 figures, text matches the version published in PLB