Non-parametric reconstruction of interaction in the cosmic dark sector
  The possibility of a non-gravitational interaction between the dark matter
and the dark energy has been reconstructed using some recent datasets. The
crucial aspect is that the interaction is not parametrized at the outset, but
rather reconstructed directly from the data in a non-parametric way. The Cosmic
Chronometer Hubble data, the Pantheon Supernova compilation of CANDELS and
CLASH Multy-Cycle Treasury programs obtained by the HST, and the Baryon
Acoustic Oscillation Hubble data have been considered in this work. The widely
accepted Gaussian Process is used for the reconstruction. The results clearly
indicate that a no interaction scenario is quite a possibility. Also, the
interaction, if any, is not really significant at the present epoch. The
direction of the flow of energy is clearly from the dark energy to the dark
matter which is consistent with the thermodynamic requirement.
