| Issue |
EPL
Volume 149, Number 5, March 2025
|
|
|---|---|---|
| Article Number | 59002 | |
| Number of page(s) | 6 | |
| Section | Gravitation, cosmology and astrophysics | |
| DOI | https://doi.org/10.1209/0295-5075/adba0c | |
| Published online | 11 March 2025 | |
Dynamical homogenization in effective loop quantum cosmology
Department of Mathematics and Statistics, University of New Brunswick - Fredericton, NB, E3B 5A3, Canada
Received: 30 January 2025
Accepted: 25 February 2025
The effective dynamics of loop quantum gravity for marginally bound Lemaître-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.
© 2025 The author(s)
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