Retrieving "Reionization" from the archives

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1. Cosmic Microwave Background (cmb)

   Linked via "reionization"

   Polarization and Secondary Effects
   The primary CMB/) signal is unpolarized. However, scattering off electrons (Thomson scattering) during recombination and subsequent reionization introduces polarization. This is categorized into two main modes:
   E-Modes (Electric/Divergence-free): Caused by anisotropic photon pressure during the early scattering. These modes are directly analogous to the intensity anisotropies and are sensitive to density fluctuations.

2. Planck Satellite

   Linked via "reionization"

   The final data release (DR3) from Planck Satellite provided the most precise constraints on the standard cosmological model ($\Lambda$CDM) available at the time of its publication. The results confirmed the nearly flat geometry of the universe and refined the Hubble constant ($H_0$) value.
   The analysis confirmed the presence of the "reionization bump" in the large-scale power spectrum, although the inferred optical depth to last scattering, $\tau_e = 0.0540 \pm 0.0074$, suggeste…