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Constraints on large-scale dark acoustic oscillations from cosmology

Cyr-Racine, Francis-Yan; de Putter, Roland; Raccanelli, Alvise +1 more

If all or a fraction of the dark matter (DM) were coupled to a bath of dark radiation (DR) in the early Universe, we expect the combined DM-DR system to give rise to acoustic oscillations of the dark matter until it decouples from the DR. Much like the standard baryon acoustic oscillations, these dark acoustic oscillations (DAO) imprint a characte…