Future weak lensing constraints in a dark coupled universe

Understand

Coupled cosmologies can predict values for the cosmological parameters at low redshifts which may differ substantially from the parameters values within non-interacting cosmologies.

• Therefore, low redshift probes, as the growth of structure and the dark matter distribution via galaxy and weak lensing surveys constitute a unique tool to constrain interacting dark sector models.
• We focus here on weak lensing forecasts from future Euclid and LSST-like surveys combined with the ongoing Planck cosmic microwave background experiment.
• We find that these future data could constrain the dimensionless coupling to be smaller than a few $\times 10^{-2}$.