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• W2938541803 abstract "The matter in our Universe comes in two flavors: dark and baryonic. Of these, only the latter couples to photons, giving rise to the well-known baryon acoustic oscillations and, in the process, generating supersonic relative velocities between dark matter and baryons. These velocities---imprinted with the acoustic scale in their genesis---impede the formation of the first stars during cosmic dawn ($zsim 20$), modulating the expected 21-cm signal from this era. In a companion paper we showed, combining numerical simulations and analytic models, that this modulation takes the form of robust velocity-induced acoustic oscillations (VAOs), with a well-understood shape that is frozen at recombination, and unaffected by the unknown astrophysics of star formation. Here we propose using these VAOs as a standard ruler at cosmic dawn. We find that three years of 21-cm power-spectrum data from the upcoming HERA interferometer should be able to measure the Hubble expansion rate $H(z)$ at $z=15-20$ to percent-level precision, ranging from $0.3%$ to $11%$ depending on the strength of astrophysical feedback processes and foregrounds. This would provide a new handle on the expansion rate of our Universe during an otherwise unprobed epoch, opening a window to the mysterious cosmic-dawn era." @default.
• W2938541803 created "2019-04-25" @default.
• W2938541803 creator A5034807028 @default.
• W2938541803 date "2019-09-26" @default.
• W2938541803 modified "2023-10-06" @default.
• W2938541803 title "Standard Ruler at Cosmic Dawn" @default.
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• W2938541803 doi "https://doi.org/10.1103/physrevlett.123.131301" @default.
• W2938541803 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31697535" @default.
• W2938541803 hasPublicationYear "2019" @default.
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