Effect of the Early Reionization on the Cosmic Microwave Background and Cosmological Parameter Estimates
arXiv:1704.08495 · doi:10.1088/1475-7516/2017/07/042
Abstract
The early reionization (ERE) is supposed to be a physical process which happens after recombination, but before the instantaneous reionization caused by the first generation of stars. We investigate the effect of the ERE on the temperature and polarization power spectra of cosmic microwave background (CMB), and adopt principal components analysis (PCA) to model-independently reconstruct the ionization history during the ERE. In addition, we also discuss how the ERE affects the cosmological parameter estimates, and find that the ERE does not impose any significant influences on the tensor-to-scalar ratio and the neutrino mass at the sensitivities of current experiments. The better CMB polarization data can be used to give a tighter constraint on the ERE and might be important for more precisely constraining cosmological parameters in the future.
11 pages, 12 figures, refs added
References in corpus (13)
- Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
- Model-independent evidence in favor of an end to reionization by z~6
- CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
- Cosmic microwave background limits on accreting primordial black holes
- Effect of Primordial Black Holes on the Cosmic Microwave Background and Cosmological Parameter Estimates
- Line Emitting Galaxies Beyond a Redshift of 7: An Improved Method for Estimating the Evolving Neutrality of the Intergalactic Medium
- New observations of z~7 galaxies: evidence for a patchy reionization
- Rapid Decline of Lyman-alpha Emission Toward the Reionization Era
- CMB polarization features from inflation versus reionization
- Cosmological Information from Lensed CMB Power Spectra
- Constraint on the abundance of primordial black holes in dark matter from Planck data
- Impact of reionization on CMB polarization tests of slow-roll inflation
- Evidence for horizon-scale power from CMB polarization