J-PAS: Forecasts for dark matter - dark energy elastic couplings
  We consider a cosmological model where dark matter and dark energy feature a
coupling that only affects their momentum transfer in the corresponding Euler
equations. We perform a fit to cosmological observables and confirm previous
findings within these scenarios that favour the presence of a coupling at more
than $3\sigma$. This improvement is driven by the Sunyaev-Zeldovich data. We
subsequently perform a forecast for future J-PAS data and find that clustering
measurements will permit to clearly discern the presence of an interaction
within a few percent level with the uncoupled case at more than $10\sigma$ when
the complete survey, covering $8500$ sq. deg., is considered. We found that the
inclusion of weak lensing measurements will not help to further constrain the
coupling parameter. For completeness, we compare to forecasts for DESI and
Euclid, which provide similar discriminating power.
