Cosmic Microwave Background Polarization Signals from Tangled Magnetic Fields

Details Cosmic Microwave Background Polarization Signals from Tangled Magnetic Fields Cosmic Microwave Background Polarization Signals from Tangled Magnetic Fields

2000-12-03

arxiv.org/abs/astro-ph/0012056v2

Phys.Rev.Lett. 87 (2001) 101301

Astronomy and Astrophysics

Astrophysics

4 pages, Revtex, matches version to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.87.101301

Tangled, primordial cosmic magnetic fields create small rotational velocity perturbations on the last scattering surface (LSS) of the cosmic microwave background radiation (CMBR). For fields which redshift to a present value of $B_0 = 3\times 10^{-9}$ Gauss, these vector modes are shown to generate polarization anisotropies of order $0.1\mu K - 4 \mu K$ 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.

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