Interacting dark energy in the early 2020s: a promising solution to the
  $H_0$ and cosmic shear tensions
  We examine interactions between dark matter and dark energy in light of the
latest cosmological observations, focusing on a specific model with coupling
proportional to the dark energy density. Our data includes Cosmic Microwave
Background (CMB) measurements from the Planck 2018 legacy data release,
late-time measurements of the expansion history from Baryon Acoustic
Oscillations (BAO) and Supernovae Type Ia (SNeIa), galaxy clustering and cosmic
shear measurements from the Dark Energy Survey Year 1 results, and the 2019
local distance ladder measurement of the Hubble constant $H_0$ from the Hubble
Space Telescope. Considering Planck data both in combination with BAO or SNeIa
data reduces the $H_0$ tension to a level which could possibly be compatible
with a statistical fluctuation. The very same model also significantly reduces
the $\Omega_{\rm m}-\sigma_8$ tension between CMB and cosmic shear
measurements. Interactions between the dark sectors of our Universe remain
therefore a promising joint solution to these persisting cosmological tensions.
