Non-linear Cosmological Perturbations for Coupled Dark Energy

TL;DR

This paper derives one-loop perturbation kernels for a coupled dark energy model, enabling tests of modified gravity in future large-scale surveys.

Contribution

It provides analytical and numerical derivations of time-dependent kernels for a coupled dark energy model, facilitating observational tests of modified gravity.

Findings

Derived accurate fitting functions for the kernels.

Provided analytical and numerical solutions for the kernels.

Enabled direct application to upcoming large-scale survey data.

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.