Universal scattering laws for quiescent bouncing cosmology
Bruno Le Floch, Philippe G. LeFloch, Gabriele Veneziano
TL;DR
This paper introduces universal scattering laws for cosmological bounces, revealing how large-scale geometries and microscopic details relate across the bounce in various gravity theories.
Contribution
It classifies local singularity scattering maps, uncovering three universal laws governing bounces, applicable across multiple quantum gravity models.
Findings
Universal laws obeyed by Bianchi I bounces in different theories
Classification of inhomogeneity and anisotropy transmission across bounces
Extraction of model-dependent degrees of freedom
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.
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