Early reionization by decaying particles in the light of three year WMAP data

Abstract

We study the reionization histories where ionizing UV photons are emitted from decaying particles, in addition to usual contributions from stars and quasars, taking account of the fact that the universe is not fully ionized until z = 6 as observed by Sloan Digital Sky Survey. Likelihood analysis of the three-year data from the WMAP (Wilkinson Microwave Anisotropy Probe) severely constrains the decaying particle scenario.In particular, the decaying particle with relatively short lifetime is not favored by the polarization data.

arXiv comment9 pages, 11 figures

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• Exotic energy injection with ExoCLASS: Application to the Higgs portal model and evaporating black holes
• Early Annihilation and Diffuse Backgrounds in 1/v WIMP models
• CMB photons shedding light on dark matter
• Reionization and dark matter decay
• The Correlation Between Star Formation and 21cm Emission During the Reionization Epoch