Detecting patchy reionization in the CMB

Abstract

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.

References in corpus (5)

• SPT-3G: A Next-Generation Cosmic Microwave Background Polarization Experiment on the South Pole Telescope
• Reconstructing Patchy Reionization from the Cosmic Microwave Background
• Precision Epoch of Reionization studies with next-generation CMB experiments
• Analytic model for the matter power spectrum, its covariance matrix, and baryonic effects
• Non-Gaussian structure of the lensed CMB power spectra covariance matrix

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