Journal article

Baryonic acoustic oscillations in 21-cm emission: a probe of dark energy out to high redshifts

J Stuart B Wyithe, Abraham Loeb, Paul M Geil

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | BLACKWELL PUBLISHING | Published : 2008

Abstract

Low-frequency observatories are currently being constructed with the goal of detecting redshifted 21-cm emission from the epoch of reionization. These observatories will also be able to detect intensity fluctuations in the cumulative 21-cm emission after reionization, from hydrogen in unresolved damped Lyα absorbers (such as gas-rich galaxies) down to a redshift z ∼ 3.5. The inferred power spectrum of 21-cm fluctuations at all redshifts will show acoustic oscillations, whose comoving scale can be used as a standard ruler to infer the evolution of the equation of state for the dark energy. We find that the first generation of low-frequency experiments (such as MWA or LOFAR) will be able to co..

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University of Melbourne Researchers