Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-11-03
Mon.Not.Roy.Astron.Soc.396:523-534,2009
Astronomy and Astrophysics
Astrophysics
16 pages, 5 figures. Version matching the version to appear in MNRAS. Title changed in the journal
Scientific paper
10.1111/j.1365-2966.2009.14727.x
We study the contribution of a stochastic background (SB) of primordial magnetic fields (PMF) on the anisotropies in temperature and polarization of the cosmic microwave background radiation (CMB). 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 SB, given a power-law dependence parametrized by a spectral index $n_B$ for the magnetic field power spectrum cut at a damping scale $k_D$. For all the values of $n_B$ 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.
Finelli Fabio
Paci Francesco
Paoletti Daniela
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