Signatures of the Baryon Acoustic Oscillations on 21cm Emission Background

Abstract

The baryon acoustic oscillations (BAO) prior to recombination should be imprinted onto the 21cm emission background from the epoch of reionization through the underlying density perturbations. Using an analytical approach for both matter power spectrum (CDM+baryons) and reionization process, we demonstrate the BAO induced signatures on the power spectrum of 21cm emission fluctuations. Future low-frequency radio telescopes such as LOFAR and MWA should be able to detect these weak BAO wiggles with an integration time of $\sim 1$ year. A combination of the BAO measurements at different redshifts $z\approx 1000$ (CMB), $z\approx 10$ (epoch of reionization) and $z\approx 0$ (clustering of galaxies) may allow one to set more robust constraints on the determinations of cosmological parameters including dark energy and its equation of state.

arXiv comment4 pages, 5 figures, accepted for publication in ApJ Lett. References updated

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• Probing reionization with the cross power spectrum of 21 cm and near-infrared radiation backgrounds
• Signatures of the Baryon Acoustic Oscillations on the Convergence Power Spectrum of Weak lensing by Large Scale Structure
• Measurement of the baryonic acoustic oscillation scale in 21 cm intensity fluctuations during the reionisation era
• LOFAR-UK White Paper: A Science case for UK involvement in LOFAR
• Self calibration of galaxy bias in spectroscopic redshift surveys of baryon acoustic oscillations
• Constraining Gravitational and Cosmological Parameters with Astrophysical Data