Testing gravity at large scales with HI intensity mapping

Abstract

We investigate the possibility of testing Einstein's general theory of relativity (GR) and the standard cosmological model via the $E_{\mathrm{G}}$ statistic using neutral hydrogen (HI) intensity mapping. We generalise the Fourier space estimator for $E_{\mathrm{G}}$ to include HI as a biased tracer of matter and forecast statistical errors using HI clustering and lensing surveys that can be performed in the near future, in combination with ongoing and forthcoming optical galaxy and Cosmic Microwave Background (CMB) surveys. We find that fractional errors $<1\%$ in the $E_{\mathrm{G}}$ measurement can be achieved in a number of cases and compare the ability of various survey combinations to differentiate between GR and specific modified gravity models. Measuring $E_{\mathrm{G}}$ with intensity mapping and the Square Kilometre Array can provide exquisite tests of gravity at cosmological scales.

9 pages, 4 figures, 1 table; typo in Table 1 corrected, discussion added; version accepted for publication in MNRAS

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Cited by in corpus (20)

• Fundamental Physics with the Square Kilometre Array
• Cosmology with Phase 1 of the Square Kilometre Array; Red Book 2018: Technical specifications and performance forecasts
• Impact of Simulated 1/f Noise for HI Intensity Mapping Experiments
• Probing gravity with a joint analysis of galaxy and CMB lensing and SDSS spectroscopy
• Astrophysics and Cosmology with Line-Intensity Mapping
• Gravitational waves $\times$ HI intensity mapping: cosmological and astrophysical applications
• Recovering lost 21 cm radial modes via cosmic tidal reconstruction
• Investigating scalar-tensor-gravity with statistics of the cosmic large-scale structure
• Modelling redshift-space distortion in the post-reionization $\mathrm{HI}$ 21-cm power spectrum
• Lensing corrections to the $E_g(z)$ statistics from large scale structure
• Cosmological Probes of Structure Growth and Tests of Gravity
• Intensity mapping of the 21cm emission: lensing
• Testing gravity with gravitational waves $\times$ electromagnetic probes cross-correlations
• The observable $E_g$ statistics
• Calibrating magnification bias for the $E_G$ statistic to test general relativity
• Full-Sky Lensing Reconstruction of 21 cm Intensity Maps
• Model-Independent Test for Gravity using Intensity Mapping and Galaxy Clustering
• Mapping Large-Scale-Structure Evolution over Cosmic Times
• Constraining beyond $\Lambda$CDM models with 21cm intensity mapping forecast observations combined with latest CMB data
• Toward testing gravity with LSST using $E_G$