Weak lensing predictions for coupled dark energy cosmologies at non-linear scales
Abstract
We present non-linear weak lensing predictions for coupled dark energy models using the CoDECS simulations. We calculate the shear correlation function and error covariance expected for these models, for forthcoming ground-based (such as DES) and space-based (Euclid) weak lensing surveys. We obtain predictions for the discriminatory power of a ground-based survey similar to DES and a space-based survey such as Euclid in distinguishing between and coupled dark energy models; we show that using the non-linear lensing signal we could discriminate between and exponential constant coupling models with β0≥0.1 at 4σ confidence level with a DES-like survey, and β0≥0.05 at 5σ confidence level with Euclid. We also demonstrate that estimating the coupled dark energy models' non-linear power spectrum, using the Halofit fitting formula, results in biases in the shear correlation function that exceed the survey errors.