CMB anisotropies due to cosmological magnetosonic waves

Details CMB anisotropies due to cosmological magnetosonic waves CMB anisotropies due to cosmological magnetosonic waves

2006-11-07

arxiv.org/abs/astro-ph/0611247v2

Phys.Rev.D75:023002,2007

Astronomy and Astrophysics

Astrophysics

17 pages, references added, version accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.75.023002

We study scalar mode perturbations (magnetosonic waves) induced by a helical stochastic cosmological magnetic field and derive analytically the corresponding cosmic microwave background (CMB) temperature and polarization anisotropy angular power spectra. We show that the presence of a stochastic magnetic field, or an homogeneous magnetic field, influences the acoustic oscillation pattern of the CMB anisotropy power spectrum, effectively acting as a reduction of the baryon fraction. We find that the scalar magnetic energy density perturbation contribution to the CMB temperature anisotropy is small compared to the contribution to the CMB $E$-polarization anisotropy.

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