Scaling defect decay and the reionization history of the Universe

Details Scaling defect decay and the reionization history of the Universe Scaling defect decay and the reionization history of the Universe

2004-06-02

arxiv.org/abs/astro-ph/0406063v1

Phys.Rev. D70 (2004) 067302

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevD.70.067302

We consider a model for the reionization history of the Universe in which a significant fraction of the observed optical depth is a result of direct reionization by the decay products of a scaling cosmic defect network. We show that such network can make a significant contribution to the reionization history of the Universe even if its energy density is very small (the defect energy density has to be greater than about $10^{-11}$ of the background density). We compute the Cosmic Microwave Background temperature, polarization and temperature-polarization cross power spectrum and show that a contribution to the observed optical depth due to the decay products of a scaling defect network may help to reconcile a high optical depth with a low redshift of complete reionization suggested by quasar data. However, if the energy density of defects is approximately a constant fraction of the background density then these models do not explain the large scale bump in the temperature-polarization cross power spectrum observed by WMAP.

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