Speaker
Description
21-cm emission from neutral hydrogen is a
promising tool for probing the matter distribution in the universe post-reionization. The
HI signals contain signatures of the primordial universe and the growth of large-scale
structure in the universe. These signatures are typically analyzed via the 2-point corre-
lation function or power spectrum. However, adding the information from the 3-point
correlation function or bispectrum will be crucial to exploiting next-generation intensity
mapping experiments. Upcoming surveys by SKAO and HIRAX will undertake inten-
sive line-intensity observations, complementing galaxy surveys. This study provides new
forecasts on cosmological constraints derived from the combined analysis of the 21cm
power spectrum and bispectrum. We use Fisher predictions to examine how useful these
surveys might be for constraining cosmological parameters.
We account for telescope beam effects, instrumental noise, foreground avoidance, the
Alcock-Paczynski effect, and theoretical modeling errors in the correlators. The investi-
gation also includes assessments of 21-cm clustering bias up to the second order.
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