On cosmological signatures of baryons-dark energy elastic couplings
  We consider a scenario where dark energy and baryons are dynamically coupled
without any energy transfer. In this scenario, the background cosmology is
unaffected and, at the perturbations level, the coupling only appears through
the corresponding Euler equations of dark energy and baryons. We then explore
some phenomenological consequences of this scenario and their signatures in
several cosmological observables. In particular, we show its ability to
suppress the growth of cosmic structures. We also constrain the parameters of
the model with cosmological data and show that an interaction of dark energy
with baryons on cosmological scales is mildly favoured.
