Weak lensing with 21cm intensity mapping at $z\sim 2-3$

Abstract

We study how 21 cm intensity mapping can be used to measure gravitational lensing over a wide range of redshift. This can extend weak lensing measurements to higher redshifts than are accessible with conventional galaxy surveys. We construct a convergence estimator taking into account the discreteness of galaxies and calculate the expected noise level as a function of redshift and telescope parameters. At $z\sim 2-3$ we find that a telescope array with a collecting area $\sim 0.2{\mathrm{km}}^2$ spread over a region with diameter $\sim 2\mathrm{km}$ would be sufficient to measure the convergence power spectrum to high accuracy for multipoles between 10 and 1,000. We show that these measurements can be used to constrain interacting dark energy models.

5 pages, 3 figures

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• Lensing reconstruction from line intensity maps: the impact of gravitational nonlinearity
• Cross-correlation cosmic shear with the SDSS and VLA FIRST surveys
• Gravitational Lensing of Cosmological 21cm Emission
• Testing gravity at large scales with HI intensity mapping
• A new estimator for gravitational lensing using galaxy and intensity mapping surveys
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• Testing gravity with gravitational waves $\times$ electromagnetic probes cross-correlations
• A new probe of the high-redshift Universe: nulling CMB lensing with interloper-free "LIM-pair" lensing
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• Cosmology with the Square Kilometre Array by SKA-Japan
• Simulations for 21 cm radiation lensing at EoR redshifts
• Reconstructing CMB fluctuations and the mean reionization optical depth
• The gravitational and lensing-ISW bispectrum of 21cm radiation
• Unveiling the Universe with Emerging Cosmological Probes
• Full-Sky Lensing Reconstruction of 21 cm Intensity Maps
• Cross-correlation cosmography with HI intensity mapping
• Reconstructing the Gravitational Lensing Potential from the Lyman-$\alpha$ Forest
• Establishing the origin of CMB B-mode polarization
• Prospects for cosmic magnification measurements using HI intensity mapping