Observational constraints on dark matter-dark energy scattering cross
  section
  In this letter, we report precise and robust observational constraints on
dark matter-dark energy scattering cross section, using the latest data from
cosmic microwave background (CMB) Planck temperature and polarization, baryon
acoustic oscillations (BAO) measurements and weak gravitational lensing data
from Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS). The scattering
scenario consists of a pure momentum exchange between the dark components, and
we find $\sigma_d < 10^{-29} \, {\rm cm^2}$ at 95\% CL from the joint analysis
(CMB + BAO + CFHTLenS), for typical dark matter particle mass of the order 1-10
${\rm GeV}/c^2$. We notice that the scattering among the dark components may
influence the growth of large scale structure in the Universe, leaving the
background cosmology unaltered.
