Dynamical homogenization in effective loop quantum cosmology
Abstract
The effective dynamics of loop quantum gravity for marginally bound Lema\^itre-Tolman-Bondi spacetimes predict that the big-bang singularity is resolved and replaced by a cosmic bounce. Numerics show that these effective dynamics also homogenize small regions soon after the bounce when inhomogeneities before the bounce are sufficiently large. These homogeneous regions typically have a width of a few Planck lengths where relative perturbations in the energy density remain less than 15%. If the bounce is followed by an inflationary period, the homogeneous region can reach cosmic scales and the amplitude of relative perturbations can be suppressed to a value compatible with observations.
Keywords
Cite
@article{arxiv.2409.18889,
title = {Dynamical homogenization in effective loop quantum cosmology},
author = {Edward Wilson-Ewing},
journal= {arXiv preprint arXiv:2409.18889},
year = {2025}
}
Comments
7 pages, 1 figure. v2: Clarifications and references added