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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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How closely do baryons follow dark matter on large scales
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Streaming Velocities and the Baryon Acoustic Oscillation Scale.
TL;DR: The impact on the baryon acoustic oscillation (BAO) peak is dramatically enhanced and the primary new effect due to advection is greatly increases the importance of including streaming velocities in the analysis of upcoming BAO measurements and opens a new window to the astrophysics of galaxy formation.
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HI and cosmological constraints from intensity mapping, optical, and CMB surveys
TL;DR: In this article, the authors forecast constraints on neutral hydrogen (HI) and cosmological parameters using near-term intensity mapping surveys with instruments such as BINGO, MeerKAT, and the SKA, and Stage III and IV optical galaxy surveys.
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Estimation of cosmological parameters from neutral hydrogen observations of the post-reionization epoch
TL;DR: In this article, the authors focus on the possibility of determining the redshift-space distortion parameter of neutral hydrogen (HI) clouds in the post-reionization era, using reasonable estimates for the observational uncertainties and configurations representative of the ongoing and upcoming radio interferometers.
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Erasing the Milky Way: new cleaning technique applied to GBT intensity mapping data
Laura Wolz,Laura Wolz,Chris Blake,F. B. Abdalla,C. J. Anderson,Tzu-Ching Chang,Youping Li,Kiyoshi Masui,Kiyoshi Masui,Eric R. Switzer,Ue-Li Pen,T. C. Voytek,Jaswant K. Yadav +12 more
TL;DR: In this paper, a new foreground removal pipeline was proposed to compute the temperature power spectrum of the intensity maps and cross-correlation with the galaxy survey data, which was shown to be robust against 21cm signal loss.
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.
Journal ArticleDOI
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).