Universal scattering laws for quiescent bouncing cosmology
General Relativity and Quantum Cosmology
2021-05-05 v3 Cosmology and Nongalactic Astrophysics
Abstract
Cosmological bounces occur in many gravity theories. We define singularity scattering maps relating large scale geometries before and after the bounce (assuming no BKL oscillations) and encoding microscopic details of the theory. By classifying all suitably local maps we uncover three universal laws: scaling of Kasner exponents, canonical transformation of matter, directional metric scaling. These are indeed obeyed by Bianchi I bounces in string theory, loop quantum cosmology and modified matter models; our classification then determines how inhomogeneities and anisotropies traverse bounces, and precisely extracts model-dependent degrees of freedom.
Cite
@article{arxiv.2006.08620,
title = {Universal scattering laws for quiescent bouncing cosmology},
author = {Bruno Le Floch and Philippe G. LeFloch and Gabriele Veneziano},
journal= {arXiv preprint arXiv:2006.08620},
year = {2021}
}
Comments
6 pages; updated presentation of the three laws