Journal Article

The scalar, vector and tensor contributions of a stochastic background of magnetic fields to cosmic microwave background anisotropies

D. Paoletti, F. Finelli and F. Paci

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 1, pages 523-534
Published in print June 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14727.x
The scalar, vector and tensor contributions of a stochastic background of magnetic fields to cosmic microwave background anisotropies

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We study the contribution of a stochastic background (SB) of primordial magnetic fields (PMFs) on the anisotropies in temperature and polarization of the cosmic microwave background (CMB) radiation. A SB of PMF modelled as a fully inhomogeneous component induces non-Gaussian scalar, vector and tensor metric linear perturbations. We give the exact expressions for the Fourier spectra of the relevant energy–momentum components of such a SB, given a power-law dependence parametrized by a spectral index nB for the magnetic field power spectrum cut at a damping scale kD. For all the values of nB considered here, the contribution to the CMB temperature pattern by such a SB is dominated by the scalar contribution and then by the vector one at higher multipoles. We also give an analytic estimate of the scalar contribution to the CMB temperature pattern.

Keywords: magnetic fields; cosmic microwave background

Journal Article.  4373 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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