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

Dionysios Karagiannis, José Fonseca, Roy Maartens, Stefano Camera

Research output: Contribution to journalArticlepeer-review

Abstract

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
Volume32
Early online date18 Apr 2021
DOIs
Publication statusPublished - 1 May 2021

Keywords

  • astro-ph.CO
  • RCUK
  • STFC
  • ST/P000592/1
  • ST/S000550/1

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