Interacting Dark Energy: Possible Explanation for 21-cm Absorption at Cosmic Dawn

Abstract

A recent observation points to an excess in the expected 21-cm brightness temperature from cosmic dawn. In this paper, we present an alternative explanation of this phenomenon, an interaction in the dark sector. Interacting dark energy models have been extensively studied recently and there is a whole variety of such in the literature. Here we particularize to a specific model in order to make explicit the effect of an interaction.

arXiv comment5 pages, 2 figures. Discussion improved, new references, conclusions unchanged. Accepted in EPJC

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• Probing Interacting Dark Energy and Scattering of Baryons with Dark Matter in Light of EDGES 21cm Signal
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• Interacting Holographic Dark Energy, the Present Accelerated Expansion and Black Holes
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• Reaching small scales with low frequency imaging: applications to the Dark Ages
• Catching p via s wave with indirect detection
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• New tests of dark sector interactions from the full-shape galaxy power spectrum
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• Sensitivities on non-spinning and spinning primordial black hole dark matter with global 21 cm troughs
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• Modifying $\Lambda$CDM dynamics via out-of-equilibrium axions: reconciling SH0ES and DESI $H_0$ values
• Implications of the cosmological 21-cm absorption profile for high-redshift star formation and deep JWST surveys