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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
Citations
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Near-term measurements with 21 cm intensity mapping: Neutral hydrogen fraction and BAO at z<2
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The Acoustic Peak in the Lyman Alpha Forest
TL;DR: In this article, the authors present the first simulation of the signature of baryonic acoustic oscillations (BAO) in Lyman alpha forest data containing 180,000 mock quasar sight-lines.
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Synergies between intensity maps of hydrogen lines
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Forecast for FAST: from Galaxies Survey to Intensity Mapping
TL;DR: In this paper, the authors make forecast on the FAST H'i large-scale structure survey by mock observations, and they consider a drift scan survey with the L-band 19 beam receiver, which may be commensal with the pulsar search and Galactic H'I survey.
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Studying high-z galaxies with [C II] intensity mapping
Bin Yue,Andrea Ferrara +1 more
TL;DR: In this article, the authors investigate the [CII] line intensity mapping (IM) signal from galaxies in the Epoch of Reionization (EoR) to assess its detectability, the possibility to constrain the $L\rm CII-{\rm SFR}$ relation, and to recover the luminosity function (LF) from future experiments.
References
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Journal ArticleDOI
Observational probes of cosmic acceleration
David H. Weinberg,Michael J. Mortonson,Daniel J. Eisenstein,Daniel J. Eisenstein,Christopher M. Hirata,Adam G. Riess,Eduardo Rozo +6 more
TL;DR: In this article, the authors present extensive forecasts for constraints on the dark energy equation of state and parameterized deviations from General Relativity, achievable with Stage III and Stage IV experimental programs that incorporate supernovae, BAO, weak lensing, and cosmic microwave background data.
Journal ArticleDOI
Reionization and Cosmology with 21-cm Fluctuations
TL;DR: In this article, the authors discuss recent advances in theoretical understanding of the epoch of reionization (EoR), the application of 21-cm tomography to cosmology and measurements of the dark energy equation of state after reionisation, and the instrumentation and observational techniques shared by 21cm EoR and postreionization cosmology machines.
Journal ArticleDOI
Clustering of dark matter tracers: generalizing bias for the coming era of precision LSS
Patrick J. McDonald,A. Roy +1 more
TL;DR: In this paper, the power spectrum and bispectrum up to 4th order in the initial density perturbations were modeled as a Taylor series in the local mass density, with the unknown coefficients in the series treated as free bias parameters.
Journal ArticleDOI
Late-time cosmology with 21cm intensity mapping experiments
TL;DR: In this paper, the authors present a framework for forecasting cosmological constraints from future neutral hydrogen intensity mapping experiments at low to intermediate redshifts, and establish a simple way of comparing such surveys with optical galaxy redshift surveys.
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How to evade the sample variance limit on measurements of redshift-space distortions
TL;DR: In this article, the authors used multiple tracers of large-scale density with different biases to measure the redshift-space distortion parameter β ≡ b −1f ≡ b−1d−ln D/d −ln a (where D is the growth factor and a the expansion factor).