On the stability of bimetric structure formation
General Relativity and Quantum Cosmology
2020-04-30 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
Bimetric gravity can reproduce the accelerated expansion of the Universe, without a cosmological constant. However, the stability of these solutions to linear perturbations has been questioned, suggesting exponential growth of structure in this approximation. We present a simple model of structure formation, for which an analytical solution is derived. The solution is well-behaved, showing that there is no physical instability with respect to these perturbations. The model can yield a growth of structure exhibiting measurable differences from CDM.
Cite
@article{arxiv.1910.01651,
title = {On the stability of bimetric structure formation},
author = {Marcus Högås and Francesco Torsello and Edvard Mörtsell},
journal= {arXiv preprint arXiv:1910.01651},
year = {2020}
}
Comments
15 pages, 7 figures. v2 slight updates in accordance with the published version