Cosmological constraints from the power spectrum and bispectrum of 21cm intensity maps

Abstract

The 21cm emission of neutral hydrogen is a potential probe of the matter distribution in the Universe after reionisation. Cosmological surveys of this line intensity will be conducted in the coming years by the SKAO and HIRAX experiments, complementary to upcoming galaxy surveys. We present the first forecasts of the cosmological constraints from the combination of the 21cm power spectrum and bispectrum. Fisher forecasts are computed for the constraining power of these surveys on cosmological parameters, the BAO distance functions and the growth function. We also estimate the constraining power on dynamical dark energy and modified gravity. Finally we investigate the constraints on the 21cm clustering bias, up to second order. We consider the effects on the 21cm correlators of the telescope beam, instrumental noise, foreground avoidance, the Alcock-Paczynski effect and theoretical errors in the modelling of the correlators. Adding Planck priors, and marginalising over nuisance parameters, HIRAX achieves sub-percent precision on the $\Lambda$CDM parameters, with SKAO delivering slightly lower precision. The modified gravity parameter $\gamma$ is constrained at 1% (HIRAX) and 5% (SKAO). For the dark energy parameters $w_0,w_a$, HIRAX delivers percent-level precision while SKAO constraints are weaker. HIRAX achieves sub-percent precision on the BAO distance functions $D_A,H$, while SKAO reaches 1-2% for $0.6\lesssim z\lesssim 1$. The growth rate $f$ is constrained at a few-percent level for the whole redshift range of HIRAX and for $0.6\lesssim z\lesssim 1$ by SKAO. The different performances arise mainly since HIRAX is a packed inteferometer that is optimised for BAO measurements, while SKAO is not optimised for interferometer cosmology and operates better in single-dish mode, where the telescope beam limits access to the smaller scales that are covered by an interferometer.

37 pages, 6 figures, version accepted by JCAP

References in corpus (41)

• In the Realm of the Hubble tension $-$ a Review of Solutions
• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Clustering of dark matter tracers: generalizing bias for the coming era of precision LSS
• Baryon Acoustic Oscillation Intensity Mapping as a Test of Dark Energy
• HMcode-2020: Improved modelling of non-linear cosmological power spectra with baryonic feedback
• Late-time cosmology with 21cm intensity mapping experiments
• Cosmology and the Bispectrum
• The bispectrum of galaxies from high-redshift galaxy surveys: primordial non-Gaussianity and non-linear galaxy bias
• Damped Lyman Alpha Systems in Galaxy Formation Simulations
• A Method for 21cm Power Spectrum Estimation in the Presence of Foregrounds
• ELUCID - Exploring the Local Universe with reConstructed Initial Density field I: Hamiltonian Markov Chain Monte Carlo Method with Particle Mesh Dynamics
• The Fast Fourier Transform Telescope
• ELUCID - Exploring the Local Universe with reConstructed Initial Density field III: Constrained Simulation in the SDSS Volume
• Constraints on Multi-Field Inflation from the BOSS Galaxy Survey
• Constraining $M_{\nu }$ with the Bispectrum II: The Total Information Content of the Galaxy Bispectrum
• Precision analysis of the redshift-space galaxy bispectrum
• HI intensity mapping with MeerKAT: Calibration pipeline for multi-dish autocorrelation observations
• Primordial Non-Gaussianity from Biased Tracers: Likelihood Analysis of Real-Space Power Spectrum and Bispectrum
• Modeling the neutral hydrogen distribution in the post-reionization Universe: intensity mapping
• SKAO HI Intensity Mapping: Blind Foreground Subtraction Challenge
• MeerKLASS: MeerKAT Large Area Synoptic Survey
• Galaxy redshift-space bispectrum: the Importance of Being Anisotropic
• The Impact of Foregrounds on Redshift Space Distortion Measurements With the Highly-Redshifted 21 cm Line
• Information Content of the Angular Multipoles of Redshift-Space Galaxy Bispectrum
• Hi intensity mapping with MeerKAT: Primary beam effects on foreground cleaning
• Dark matter and halo bispectrum in redshift space: theory and applications
• Information content in the redshift-space galaxy power spectrum and bispectrum
• Quijote-PNG: Simulations of primordial non-Gaussianity and the information content of the matter field power spectrum and bispectrum
• HI intensity mapping with MeerKAT: 1/f noise analysis
• The Covariance of Squeezed Bispectrum Configurations
• The Halo Bispectrum Multipoles in Redshift Space
• Galaxy 2-Point Covariance Matrix Estimation for Next Generation Surveys
• Detecting the relativistic bispectrum in 21cm intensity maps
• Detecting the power spectrum turnover with HI intensity mapping
• Quijote-PNG: Quasi-maximum likelihood estimation of Primordial Non-Gaussianity in the non-linear dark matter density field
• Probing primordial non-Gaussianity with the power spectrum and bispectrum of future 21cm intensity maps
• The BINGO Project V: Further steps in Component Separation and Bispectrum Analysis
• Primordial non-Gaussianity and non-Gaussian Covariance
• HI intensity mapping with the MIGHTEE survey: power spectrum estimates
• The halo 3-point correlation function: a methodological analysis

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• New constraints on cosmological modified gravity theories from anisotropic three-point correlation functions of BOSS DR12 galaxies
• Prospects for measuring dark energy with 21 cm intensity mapping experiments: A joint survey strategy
• Future prospects on testing extensions to $\Lambda$CDM through the weak lensing of gravitational waves
• Primordial non-Gaussianity and non-Gaussian Covariance
• Multi-tracer power spectra and bispectra: Formalism
• Multipole expansion for 21cm Intensity Mapping power spectrum: forecasted cosmological parameters estimation for the SKA Observatory
• Interferometric HI intensity mapping: perturbation theory predictions and foreground removal effects
• Cosmological constraints from the EFT power spectrum and tree-level bispectrum of 21cm intensity maps
• Reionisation time fields reconstruction from 21 cm signal maps
• Squeezing information from radio surveys to probe the primordial Universe
• HI Intensity Mapping cross-correlation with thermal SZ fluctuations: forecasted cosmological parameters estimation for FAST and Planck
• Testing the growth of cosmic structures during the Dark Ages
• Probing the large-scale structure with 21cm-galaxy cross-bispectrum: Estimates from simulations and forecasts for upcoming cosmological surveys