Non-linear Cosmological Perturbations for Coupled Dark Energy

We estimate the one-loop perturbation kernels for a minimal modified gravity model in which dark energy is coupled to dark mater 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.
Comment: a typo in Eq. (3.29) has been corrected