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Probing primordial non-Gaussianity with the power spectrum and bispectrum of future 21cm intensity maps

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After reionisation, the 21cm emission line of neutral hydrogen within galaxies provides a tracer of dark matter. Next-generation intensity mapping surveys, with the SKA and other radio telescopes, will cover large sky areas and a wide range of redshifts, facilitating their use as probes of primordial non-Gaussianity. {Previous works have shown that the bispectrum can achieve tight constraints on primordial non-Gaussianity with future surveys that are purposely designed for intensity mapping in interferometer mode}. Here we investigate the constraints attainable from surveys operating in single-dish mode, \rev{using the combined power spectrum and bispectrum signal}. In the case of the power spectrum, single-dish surveys typically outperform interferometer surveys. We find that the reverse holds for the bispectrum: single-dish surveys are not competitive with surveys designed for interferometer mode.
Original languageEnglish
Article number100821
Number of pages17
JournalPhysics of the Dark Universe
Early online date18 Apr 2021
Publication statusPublished - 1 May 2021


  • Probing primordial non-Gaussianity

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    Licence: CC BY-NC-ND

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