Early reionization by decaying particles and cosmic microwave background radiation

Abstract

We study the reionization scenario in which ionizing UV photons emitted from decaying particle, in addition to usual contributions from stars and quasars, ionize the universe. It is found that the scenario is consistent with both the first year data of the Wilkinson Microwave Anisotropy Probe and the fact that the universe is not fully ionized until z \sim 6 as observed by Sloan Digital Sky Survey. Likelihood analysis revealed that rather broad parameter space can be chosen. This scenario will be discriminated by future observations, especially by the EE polarization power spectrum of cosmic microwave background radiation.

5 pages, 5 figures, fig 2, table 1, and some typos are corrected

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Cited by in corpus (14)

• Cosmology at Low Frequencies: The 21 cm Transition and the High-Redshift Universe
• Impact of dark matter decays and annihilations on reionization
• Relic keV sterile neutrinos and reionization
• Contraints on radiative dark-matter decay from the cosmic microwave background
• 21cm Limits on Decaying Dark Matter and Primordial Black Holes
• The Effects of Dark Matter Decay and Annihilation on the High-Redshift 21 cm Background
• The impacts of dark matter particle annihilation on recombination and the anisotropies of the cosmic microwave background
• Primordial Neutrinos
• Reionization - A probe for the stellar population and the physics of the early universe
• The Epoch of Reionization
• Early Annihilation and Diffuse Backgrounds in 1/v WIMP models
• Particle decay in the early universe: predictions for 21 cm
• Early reionization by decaying particles in the light of three year WMAP data
• Cosmology with Light Axions from Technicolor