Non-linear Cosmological Perturbations for Coupled Dark Energy
Cosmology and Nongalactic Astrophysics
2026-04-21 v5
Abstract
We derive the one-loop perturbation kernels for a minimal modified gravity model in which dark energy is coupled to dark matter via a constant coupling. We derive the time-dependent kernels via analytical and numerical solutions and provide accurate fitting functions. These kernels can be directly employed to test for modified gravity in forthcoming large-scale surveys.
Cite
@article{arxiv.2411.06014,
title = {Non-linear Cosmological Perturbations for Coupled Dark Energy},
author = {Bilal Tüdes and Luca Amendola},
journal= {arXiv preprint arXiv:2411.06014},
year = {2026}
}
Comments
Changed the notation for the initial time from $\eta_0$ to $\eta_i$, to avoid confusion with present time. A typo mistake in the second term of Eq. (3.8) is corrected.Corrected some typos and recalculated some fitting functions, conclusions unchanged