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Constraining the dark matter-vacuum energy interaction using the EDGES 21-cm absorption signal

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  • Yuting Wang
  • Gong-Bo Zhao
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 ΛCDM model at a 3.8σ 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 ΛCDM 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.
Original languageEnglish
Article number26
Number of pages5
JournalThe Astrophysical Journal
Volume869
Issue number1
DOIs
Publication statusPublished - 7 Dec 2018

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