Early reionization by cosmic strings revisited
Abstract
Measurements of the CMB temperature anisotropy and the temperature-polarization cross correlation by WMAP suggest a reionization redshift of z 17 5. On the other hand, observations of high redshift galaxies indicate a presence of a significant fraction of neutral hydrogen at redshift z 6-7. We show that cosmic strings with tensions well within, but not far from, current observation bounds could cause early star formation at a level sufficient to explain the high reionization redshift.
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