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Reconstructing large scales at cosmic dawn
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The cosmic microwave background (CMB) serves as a backlight to large-scale structure during the epoch of reionization, where Thomson scattering gives rise to temperature anisotropies on small angular scales from the kinetic Sunyaev Zel'dovich (kSZ) effect. In this paper, we demonstrate that the technique of kSZ tomography (velocity reconstruction), based on cross correlations between CMB temperature and 21cm surveys, can significantly improve constraints on models of inhomogeneous reionization and provide information about large-scale modes that are poorly characterized by 21cm measurements themselves due to foreground contamination.
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Cited by 2 Pith papers
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Velocity Reconstruction from KSZ: Measuring $f_{NL}$ with ACT and DESILS
The first 3D velocity reconstruction from a photometric galaxy survey detects the galaxy-velocity power spectrum at 11.7 sigma and constrains fNL = -39 +40/-33.
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Neutrino Mass Constraints from kSZ Tomography
kSZ tomography will add little to neutrino mass constraints from Stage IV surveys unless the kSZ optical depth degeneracy is broken.
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