title: Cosmic microwave background polarization signals from tangled magnetic fields.
abstract: Tangled, primordial cosmic magnetic fields create small rotational velocity perturbations on the last scattering surface of the cosmic microwave background radiation. For fields which redshift to a present value of B0 = 3 x 10(-9) G, these vector modes are shown to generate polarization anisotropies of order 0.1-4 microK on small angular scales (500<l<2000), assuming delta function or a power law spectra with n = -1. About 200 times larger signals result for n = 2 spectra. Unlike inflation generated, scalar modes, these signals are dominated by the odd parity, B-type polarization, which could help in their detection.
authors.affiliation: Harish-Chandra Research Institute, Chhatnag Road, Jhusi, Allahabad 211019, India.
authors.forename: T R
authors.initials: TR
authors.lastname: Seshadri
authors.forename: K
authors.initials: K
authors.lastname: Subramanian