Title:	Tangled magnetic fields and CMBR signal from reionization epoch
Authors:	Gopal, Rajesh Sethi, S.K.
Issue Date:	17-Nov-2005
Publisher:	American Physical Society
Citation:	Physical Review D, 2005, Vol.72, 103003
Abstract:	We compute the secondary cosmic microwave background radiation (CMBR) anisotropy signal from the reionization of the Universe in the presence of tangled magnetic fields. We consider the tangled-magnetic-field-induced scalar, vector, and tensor modes for our analysis. The most interesting signal for [script-l]<~100 arises from tensor perturbations. In particular, we show that the enhancement observed by Wilkinson microwave anisotropy probe (WMAP) in the TE cross-correlation signal for [script-l]<~10 could be explained by tensor TE cross correlation from tangled magnetic fields generated during the inflationary epoch for magnetic field strength B0~=4.5×10-9 G and magnetic field power spectrum spectral index n~=-2.9. Alternatively, a mixture of tensor mode signal with primordial scalar modes gives weaker bounds on the value of the optical depth to the reionization surface, taureion: taureion=0.11±0.02. This analysis can also be translated to a limit on magnetic field strength of ~=5×10-9 G for wave numbers <~0.05 Mpc-1.
URI:	http://hdl.handle.net/2289/1182
ISSN:	0031-9007 1079-7114 (online)
Alternative Location:	http://link.aps.org/abstract/PRD/v72/e103003
Copyright:	(2005) by the American Physical Society
Appears in Collections:	Research Papers (A&A)

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