Probing the Reionization History of the Universe using the Cosmic Microwave Background Polarization

  title={Probing the Reionization History of the Universe using the Cosmic Microwave Background Polarization},
  author={Manoj Kaplinghat and Mike Chu and Zolt{\'a}n Haiman and Gilbert P. Holder and Lloyd Knox and Constantinos Skordis},
  journal={The Astrophysical Journal},
The recent discovery of a Gunn-Peterson (GP) trough in the spectrum of the redshift 6.28 SDSS quasar has raised the tantalizing possibility that we have detected the reionization of the universe. However, a neutral fraction (of hydrogen) as small as 0.1% is sufficient to cause the GP trough; hence, its detection alone cannot rule out reionization at a much earlier epoch. The cosmic microwave background (CMB) polarization anisotropy offers an alternative way to explore the dark age of the… 

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