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Baryon Acoustic Oscillation Intensity Mapping of Dark Energy
TLDR
Here it is shown how the study of acoustic oscillation in the 21 cm brightness can be accomplished by economical three-dimensional intensity mapping, and may be the starting point for a new class of dark energy experiments dedicated to large angular scale mapping of the radio sky, shedding light on dark energy.Abstract:
The expansion of the universe appears to be accelerating, and the mysterious anti-gravity agent of this acceleration has been called ``dark energy''. To measure the dynamics of dark energy, Baryon Acoustic Oscillations (BAO) can be used. Previous discussions of the BAO dark energy test have focused on direct measurements of redshifts of as many as $10^9$ individual galaxies, by observing the 21cm line or by detecting optical emission. Here we show how the study of acoustic oscillation in the 21 cm brightness can be accomplished by economical three dimensional intensity mapping. If our estimates gain acceptance they may be the starting point for a new class of dark energy experiments dedicated to large angular scale mapping of the radio sky, shedding light on dark energy.read more
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Imprints of non-standard Dark Energy and Dark Matter Models on the 21cm Intensity Map Power Spectrum
TL;DR: In this paper, the imprint of non-standard dark energy (DE) and dark matter (DM) models on the 21cm intensity map power spectra from high-redshift neutral hydrogen (HI) gas was studied.
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An Eigenvector-Based Method of Radio Array Calibration and Its Application to the Tianlai Cylinder Pathfinder
Shifan Zuo,Ue-Li Pen,Ue-Li Pen,Fengquan Wu,Jixia Li,Albert Stebbins,Yougang Wang,Xuelei Chen,Xuelei Chen +8 more
TL;DR: In this article, an eigenvector-based formalism for the calibration of radio interferometer arrays is proposed, which can be applied with poorly known beam model of the antenna, is insensitive to outliers or imperfections in the data, and has low computational complexity.
Journal Article
It's Always Darkest Before the Cosmic Dawn: Early Results from Novel Tools and Telescopes for 21 cm Cosmology
TL;DR: Tegmark et al. as discussed by the authors explored a number of advancements toward detecting and characterizing the 21 cm signal from the Cosmic Dawn, especially during its final stage, the epoch of reionization.
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Cosmological constraints from the power spectrum and bispectrum of 21cm intensity maps
TL;DR: In this article , the authors present the first forecasts of the cosmological constraints from the combination of the 21cm power spectrum and bispectrum, and investigate the constraints on the 21 cm clustering bias, up to second order.
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Forecasts of cosmological constraints from HI intensity mapping with FAST, BINGO & SKA-I
TL;DR: In this article, the cosmological constraints of the neutral hydrogen (HI) intensity mapping (IM) technique with radio telescopes were forecast by assuming 1-year of observational time. And they also forecast the combined constraints of three radio telescopes with Planck.
References
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