First observational constraints on cosmic backreaction over an extended redshift range
Cosmology and Nongalactic Astrophysics
2026-04-14 v1
Abstract
In the recent preprint arXiv:2604.07244v1, the authors introduce a novel combination of redshift, distance, and expansion rate observables for constraining cosmic backreaction. The current work presents a first application of the method, yielding the first direct constraints on the total cosmic backreaction in our Universe over a significant redshift range. The constraints are consistent with vanishing backreaction within one standard deviation. However, the constraints are fairly weak and significant backreaction cannot be ruled out.
Keywords
Cite
@article{arxiv.2604.11249,
title = {First observational constraints on cosmic backreaction over an extended redshift range},
author = {S. M. Koksbang},
journal= {arXiv preprint arXiv:2604.11249},
year = {2026}
}
Comments
Addendum to "Observational Tests for Distinguishing Classes of Cosmological Models'' (arXiv:2604.07244v1)