Constraints on primordial non-Gaussianity from future Hi intensity mapping experiments

Li, Yichao; Ma, Yin‐Zhe

doi:10.1103/physrevd.96.063525

Cited by 22 publications

(14 citation statements)

References 71 publications

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“…In this respect, the 21 cm signal has been identified as unique because it is present throughout the Universe and could provide us with an enormous volume (the entire sky between redshift 0 and z < 150). While non-Gaussianity from 21 cm has been studied in the dark ages [132][133][134] and the epoch of reionization [135][136][137], our focus in this section will be on the lowredshift universe [113,[138][139][140][141], specifically constraints coming from the proposed Stage II experiment in the redshift range 2 ≤ z ≤ 6. We follow the forecasting methodology of [142].…”

Section: Primordial Non-gaussianitymentioning

confidence: 99%

Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment

Ansari,

Arena,

Bandura

et al. 2018

Preprint

126

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Section: Primordial Non-gaussianitymentioning

confidence: 99%

Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment

Ansari,

Arena,

Bandura

et al. 2018

Preprint

126

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“…They predict that a cosmic variance limited experiment would be able to measure fNL down to σ f NL ∼ 0.03, and thus able to constrain single-field slow-roll inflation (Maldacena 2003;Acquaviva et al 2003). Observations of PNG at lower redshifts rely on the scale dependence of the halo bias and can achieve competitive constraints for the primordial non-Gaussianity parameter D'Aloisio et al 2013;Li & Ma 2017;Raccanelli et al 2017;Karagiannis et al 2018). The prospects of constraining PNG with the cosmic 21cm signal are thus promising.…”

Section: Primordial Bispectrummentioning

confidence: 99%

The gravitational and lensing-ISW bispectrum of 21 cm radiation

Schmit

Heavens

Pritchard

2018

Monthly Notices of the Royal Astronomical Society

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Cosmic Microwave Background experiments from COBE to Planck, have launched cosmology into an era of precision science, where many cosmological parameters are now determined to the percent level. Next generation telescopes, focussing on the cosmological 21cm signal from neutral hydrogen, will probe enormous volumes in the low-redshift Universe, and have the potential to determine dark energy properties and test modifications of Einstein's gravity. We study the 21cm bispectrum due to gravitational collapse as well as the contribution by line of sight perturbations in the form of the lensing-ISW bispectrum at low-redshifts (z ∼ 0.35 − 3), targeted by upcoming neutral hydrogen intensity mapping experiments. We compute the expected bispectrum amplitudes and use a Fisher forecast model to compare power spectrum and bispectrum observations of intensity mapping surveys by CHIME, MeerKAT and SKA-mid. We find that combined power spectrum and bispectrum observations have the potential to decrease errors on the cosmological parameters by an order of magnitude compared to Planck. Finally, we compute the contribution of the lensing-ISW bispectrum, and find that, unlike for the cosmic microwave background analyses, it can safely be ignored for 21cm bispectrum observations.

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“…One target is looking for features in the power spectrum which might tell us about inflationary physics (Chluba 2018). Another is looking for signatures of new physics by searching for non-Gaussianity in 21 cm data (Li & Ma 2017).…”

Section: Low Redshift: Post-reionizationmentioning

confidence: 99%

Data Analysis for Precision 21 cm Cosmology

Liu

Shaw

2020

PASP

176

103

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The redshifted 21 cm line is an emerging tool in cosmology, in principle permitting three-dimensional surveys of our Universe that reach unprecedentedly large volumes, previously inaccessible length scales, and hitherto unexplored epochs of our cosmic timeline. Large radio telescopes have been constructed for this purpose, and in recent years there has been considerable progress in transforming 21 cm cosmology from a field of considerable theoretical promise to one of observational reality. Increasingly, practitioners in the field are coming to the realization that the success of observational 21 cm cosmology will hinge on software algorithms and analysis pipelines just as much as it does on careful hardware design and telescope construction. This review provides a pedagogical introduction to stateof-the-art ideas in 21 cm data analysis, covering a wide variety of steps in a typical analysis pipeline, from calibration to foreground subtraction to mapmaking to power spectrum estimation to parameter estimation.∆ 2 (k) [(mK) 2 ] z = 10, x HI = 0.878 z = 9, x HI = 0.776 z = 8, x HI = 0.595 z = 7, x HI = 0.283 z = 6, x HI = 0.004

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Constraints on primordial non-Gaussianity from future Hi intensity mapping experiments

Cited by 22 publications

References 71 publications

Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment

Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment

The gravitational and lensing-ISW bispectrum of 21 cm radiation

Data Analysis for Precision 21 cm Cosmology

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