Interacting dark energy in the early 2020s: A promising solution to the [formula omitted] 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 Ω m − σ 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. [ABSTRACT FROM AUTHOR]