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 $\Lambda$CDM and coupled dark energy models; we show that using the non-linear lensing signal we could discriminate between $\Lambda$CDM and exponential constant coupling models with ${\beta }_0\ge 0.1$ at $4\sigma$ confidence level with a DES-like survey, and ${\beta }_0\ge 0.05$ at $5\sigma$ confidence level with Euclid. We also demonstrate that estimating the coupled dark energy models' non-linear power spectrum, using the $\Lambda$CDM Halofit fitting formula, results in biases in the shear correlation function that exceed the survey errors.

9 pages, 5 figures, v2: accepted for publication in MNRAS

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• Cosmology and Fundamental Physics with the Euclid Satellite
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• Cosmological constraints on interacting dark energy with redshift-space distortion after Planck data
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• The halo mass function in interacting Dark Energy models
• Disentangling dark sector models using weak lensing statistics
• Characterizing dark interactions with the halo mass accretion history and structural properties
• Constraints on the dark matter and dark energy interactions from weak lensing bispectrum tomography
• Effective dark energy equation of state in interacting dark energy models
• Raytracing simulations of coupled dark energy models
• Interacting parametrized post-Friedmann method
• Interacting Dark Energy: New parametrization and observational constraints
• Dark Energy Simulations
• Dark energy model selection with current and future data