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Detecting Patchy Reionization in the Cosmic Microwave Background.

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New methods will precisely measure the cosmic microwave background (CMB) to separate the kinematic Sunyaev-Zel'dovich (KSZ) effect, enabling new insights into the reionization era.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Observational Astronomy

Background:

  • Upcoming cosmic microwave background (CMB) experiments aim for high-precision measurements of temperature fluctuations at small angular scales.
  • Small-scale CMB fluctuations are influenced by late-time phenomena including gravitational lensing, the kinematic Sunyaev-Zel'dovich (KSZ) effect, and foreground contamination.

Purpose of the Study:

  • To develop a novel statistical method for disentangling the KSZ signal from other effects in CMB data.
  • To enable the decomposition of the KSZ signal into distinct redshift bins.
  • To facilitate high-significance measurements of the reionization era using future CMB experiments.

Main Methods:

  • A new statistic is proposed to separate the KSZ signal from gravitational lensing and foregrounds.
  • The statistic allows for the decomposition of the KSZ signal across various redshift bins.
  • The method is designed to function without the need for external datasets like galaxy surveys.

Main Results:

  • The proposed statistic effectively separates the KSZ signal from other contaminating effects.
  • The KSZ signal can be decomposed into redshift bins, extending to high redshifts.
  • Patchy reionization signals at high redshift can be distinctly isolated.

Conclusions:

  • The developed statistic offers a powerful tool for analyzing small-scale CMB fluctuations.
  • Future CMB experiments can leverage this method to obtain novel and high-significance data on the reionization epoch.
  • This approach advances our ability to study cosmic reionization using CMB observations.