Constraining the dark matter-vacuum energy interaction using the EDGES
  21-cm absorption signal
  The recent measurement of the global 21-cm absorption signal reported by the
Experiment to Detect the Global Epoch of Reionization Signature (EDGES)
Collaboration is in tension with the prediction of the $\Lambda$CDM model at a
$3.8\,\sigma$ significance level. In this work, we report that this tension can
be released by introducing an interaction between dark matter and vacuum
energy. We perform a model parameter estimation using a combined dataset
including EDGES and other recent cosmological observations, and find that the
EDGES measurement can marginally improve the constraint on parameters that
quantify the interacting vacuum, and that the combined dataset favours the
$\Lambda$CDM at 68\% CL. This proof-of-the-concept study demonstrates the
potential power of future 21-cm experiments to constrain the interacting dark
energy models.
