Cosmic polarimetry in magnetoactive plasmas

Details Cosmic polarimetry in magnetoactive plasmas Cosmic polarimetry in magnetoactive plasmas

2008-12-11

arxiv.org/abs/0812.2207v1

Phys.Rev.D79:063007,2009

Astronomy and Astrophysics

Astrophysics

34 pages, 13 figures

Scientific paper

10.1103/PhysRevD.79.063007

Polarimetry of the Cosmic Microwave Background (CMB) represents one of the possible diagnostics aimed at testing large-scale magnetism at the epoch of the photon decoupling. The propagation of electromagnetic disturbances in a magnetized plasma leads naturally to a B-mode polarization whose angular power spectrum is hereby computed both analytically and numerically. Combined analyses of all the publicly available data on the B-mode polarization are presented, for the first time, in the light of the magnetized $\Lambda$CDM scenario. Novel constraints on pre-equality magnetism are also derived in view of the current and expected sensitivities to the B-mode polarization.

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