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Scaling defect decay and the reionization history of the Universe

Title
Scaling defect decay and the reionization history of the Universe
Type
Article in International Scientific Journal
Year
2004
Authors
Avelino, PP
(Author)
FCUP
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Barbosa, D
(Author)
Other
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Journal
Vol. 70
Pages: 067302-1-067302-4
ISSN: 0556-2821
Other information
Authenticus ID: P-000-8J0
Abstract (EN): 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 Wilkinson Microwave Anisotropy Probe.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 4
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