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Detecting patchy reionization in the CMB
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Upcoming cosmic microwave background (CMB) experiments will measure temperature fluctuations on small angular scales with unprecedented precision. Small-scale CMB fluctuations are a mixture of late-time effects: gravitational lensing, Doppler shifting of CMB photons by moving electrons (the kSZ effect), and residual foregrounds. We propose a new statistic which separates the kSZ signal from the others, and also allows the kSZ signal to be decomposed in redshift bins. The decomposition extends to high redshift, and does not require external datasets such as galaxy surveys. In particular, the high-redshift signal from patchy reionization can be cleanly isolated, enabling future CMB experiments to make high-significance and qualitatively new measurements of the reionization era.
Forward citations
Cited by 3 Pith papers
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Peculiar-velocity distribution functions and 21-cm fluctuations
Derives the joint PDF for squared peculiar velocities at separated points and shows that neglecting directional anisotropy in velocity correlations causes errors of a few percent or less in 21-cm fluctuation predictions.
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Patchy Helium and Hydrogen Reionization from the Kinetic Sunyaev-Zel'dovich Effect and Galaxies
Forecasts show that cross-correlating kSZ temperature-squared maps with galaxy-reconstructed velocity-squared maps can jointly constrain hydrogen and helium reionization, making helium measurable with CMB-HD and MegaMapper.
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Fractional Dark Matter decay: cosmological imprints and observational constraints
Cosmological data limit a pre-recombination decaying dark matter fraction to at most about 2.7%, and future kSZ measurements could provide an independent test.
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