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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1182

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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