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We explore the information content of 21cm intensity maps in redshift spaceusing the 1-loop Effective Field Theory power spectrum model and the bispectrumat tree level. The 21cm signal contains signatures of dark matter, dark energyand the growth of large-scale structure in the Universe. These signatures aretypically analyzed via the 2-point correlation function or power spectrum.However, adding the information from the 3-point correlation function orbispectrum will be crucial to exploiting next-generation intensity mappingexperiments. The bispectrum could offer a unique opportunity to break keyparameter degeneracies that hinder the measurement of cosmological parametersand improve on the precision. We use a Fisher forecast analysis to estimate theconstraining power of the HIRAX survey on cosmological parameters, dark energyand modified gravity.

Cosmological constraints from the EFT power spectrum and tree-level bispectrum of 21cm intensity maps