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The gravitational and lensing-ISW bispectrum of 21 cm radiation

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Title: The gravitational and lensing-ISW bispectrum of 21 cm radiation
Authors: Schmit, CJ
Heavens, AF
Pritchard, JR
Item Type: Journal Article
Abstract: 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 per cent level. Next-generation telescopes, focusing on the cosmological 21 cm 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 21 cm 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 Canadian Hydrogen Intensity Mapping Experiment (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 21 cm bispectrum observations.
Issue Date: 1-Mar-2019
Date of Acceptance: 6-Dec-2018
URI: http://hdl.handle.net/10044/1/69965
DOI: https://dx.doi.org/10.1093/mnras/sty3400
ISSN: 0035-8711
Publisher: Oxford University Press (OUP)
Start Page: 4259
End Page: 4275
Journal / Book Title: Monthly Notices of the Royal Astronomical Society
Volume: 483
Issue: 3
Copyright Statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Sponsor/Funder: Commission of the European Communities
Funder's Grant Number: 638743
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
methods: statistical
cosmological parameters
large-scale structure of Universe
PRIMORDIAL NON-GAUSSIANITY
I MASS FUNCTION
H-I
CENTIMETER FLUCTUATIONS
POWER SPECTRUM
GALAXIES
CONSTRAINTS
COSMOLOGY
CFHTLENS
SHEAR
0201 Astronomical and Space Sciences
Publication Status: Published
Open Access location: https://arxiv.org/pdf/1810.00973.pdf
Online Publication Date: 2018-12-17
Appears in Collections:Physics
Astrophysics



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