Constraining the interaction between dark matter and dark energy with
  CMB data
  We briefly discuss the intriguing case of a phenomenological
non-gravitational coupling in the dark sector, where the interaction is
parameterized as an energy transfer either from dark matter to dark energy or
the opposite. We show that a non-zero coupling with an energy flow from the
latter to the former leads to a full reconciliation of the tension between
high- and low-redshift observations present in the standard cosmological model.
