Detecting the relativistic bispectrum in 21cm intensity maps

Sheean Jolicoeur; Roy Maartens; Eline M. De Weerd; Obinna Umeh; Chris Clarkson; Stefano Camera

doi:10.1088/1475-7516/2021/06/039

Detecting the relativistic bispectrum in 21cm intensity maps

Sheean Jolicoeur, Roy Maartens, Eline M. De Weerd, Obinna Umeh, Chris Clarkson, Stefano Camera

Institute of Cosmology & Gravitation

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Abstract

We investigate the detectability of leading-order relativistic effects in the bispectrum of future 21cm intensity mapping surveys. The relativistic signal arises from Doppler and other line-of-sight effects in redshift space. In the power spectrum of a single tracer, these effects are suppressed by a factor Script H²/k². By contrast, in the bispectrum the relativistic signal couples to short-scale modes, leading to an imaginary contribution that scales as Script H/k, thus increasing the possibility of detection. Previous work has shown that this relativistic signal is detectable in a Stage IV Hα galaxy survey. We show that the signal is also detectable by next-generation 21cm intensity maps, but typically with a lower signal-to-noise, due to foreground and telescope beam effects.

Original language	English
Article number	039
Pages (from-to)	1-22
Number of pages	22
Journal	Journal of Cosmology and Astroparticle Physics
Volume	2021
Issue number	06
DOIs	https://doi.org/10.1088/1475-7516/2021/06/039
Publication status	Published - 22 Jun 2021

Keywords

astro-ph.CO
UKRI
STFC
ST/S000550/1
ST/P000592/1

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10.1088/1475-7516/2021/06/039

Detecting the relativistic bispectrum
This Accepted Manuscript is available for reuse under a CC BY-NC-ND licence after the 12 month embargo period provided that all the terms and conditions of the licence are adhered to.
Accepted author manuscript (Post-print), 1 MBLicence: CC BY-NC-ND

Data availability statement for 'Detecting the relativistic bispectrum in 21cm intensity maps'.
Jolicoeur, S. (Creator), Maartens, R. (Creator), Weerd, E. M. D. (Creator), Umeh, O. (Creator), Clarkson, C. (Creator) & Camera, S. (Creator), IOP Publishing, 13 May 2021
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title = "Detecting the relativistic bispectrum in 21cm intensity maps",

abstract = "We investigate the detectability of leading-order relativistic effects in the bispectrum of future 21cm intensity mapping surveys. The relativistic signal arises from Doppler and other line-of-sight effects in redshift space. In the power spectrum of a single tracer, these effects are suppressed by a factor Script H2/k2. By contrast, in the bispectrum the relativistic signal couples to short-scale modes, leading to an imaginary contribution that scales as Script H/k, thus increasing the possibility of detection. Previous work has shown that this relativistic signal is detectable in a Stage IV Hα galaxy survey. We show that the signal is also detectable by next-generation 21cm intensity maps, but typically with a lower signal-to-noise, due to foreground and telescope beam effects.",

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author = "Sheean Jolicoeur and Roy Maartens and Weerd, {Eline M. De} and Obinna Umeh and Chris Clarkson and Stefano Camera",

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T1 - Detecting the relativistic bispectrum in 21cm intensity maps

AU - Jolicoeur, Sheean

AU - Maartens, Roy

AU - Weerd, Eline M. De

AU - Umeh, Obinna

AU - Clarkson, Chris

AU - Camera, Stefano

N1 - 18 pages, 12 figures, Version accepted by JCAP

PY - 2021/6/22

Y1 - 2021/6/22

N2 - We investigate the detectability of leading-order relativistic effects in the bispectrum of future 21cm intensity mapping surveys. The relativistic signal arises from Doppler and other line-of-sight effects in redshift space. In the power spectrum of a single tracer, these effects are suppressed by a factor Script H2/k2. By contrast, in the bispectrum the relativistic signal couples to short-scale modes, leading to an imaginary contribution that scales as Script H/k, thus increasing the possibility of detection. Previous work has shown that this relativistic signal is detectable in a Stage IV Hα galaxy survey. We show that the signal is also detectable by next-generation 21cm intensity maps, but typically with a lower signal-to-noise, due to foreground and telescope beam effects.

AB - We investigate the detectability of leading-order relativistic effects in the bispectrum of future 21cm intensity mapping surveys. The relativistic signal arises from Doppler and other line-of-sight effects in redshift space. In the power spectrum of a single tracer, these effects are suppressed by a factor Script H2/k2. By contrast, in the bispectrum the relativistic signal couples to short-scale modes, leading to an imaginary contribution that scales as Script H/k, thus increasing the possibility of detection. Previous work has shown that this relativistic signal is detectable in a Stage IV Hα galaxy survey. We show that the signal is also detectable by next-generation 21cm intensity maps, but typically with a lower signal-to-noise, due to foreground and telescope beam effects.

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KW - UKRI

KW - STFC

KW - ST/S000550/1

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JO - Journal of Cosmology and Astroparticle Physics

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Detecting the relativistic bispectrum in 21cm intensity maps

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Data availability statement for 'Detecting the relativistic bispectrum in 21cm intensity maps'.

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