Standard Ruler at Cosmic Dawn
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 (z ~ 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. Furthermore, 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.
- Authors:
-
- Harvard Univ., Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Harvard Univ., Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1613062
- Alternate Identifier(s):
- OSTI ID: 1566935
- Grant/Contract Number:
- SC0019018
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 13; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Physics; Cosmological parameters; CosmologyDark energy; Evolution of the Universe; Intergalactic medium; Large scale structure of the Universe; Astrophysical & cosmological simulations
Citation Formats
Muñoz, Julian B. Standard Ruler at Cosmic Dawn. United States: N. p., 2019.
Web. doi:10.1103/physrevlett.123.131301.
Muñoz, Julian B. Standard Ruler at Cosmic Dawn. United States. https://doi.org/10.1103/physrevlett.123.131301
Muñoz, Julian B. 2019.
"Standard Ruler at Cosmic Dawn". United States. https://doi.org/10.1103/physrevlett.123.131301. https://www.osti.gov/servlets/purl/1613062.
@article{osti_1613062,
title = {Standard Ruler at Cosmic Dawn},
author = {Muñoz, Julian B.},
abstractNote = {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 (z ~ 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. Furthermore, 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.},
doi = {10.1103/physrevlett.123.131301},
url = {https://www.osti.gov/biblio/1613062},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 13,
volume = 123,
place = {United States},
year = {Thu Sep 26 00:00:00 EDT 2019},
month = {Thu Sep 26 00:00:00 EDT 2019}
}
Web of Science
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