The V-mode polarization of the Cosmic Microwave Background

Details The V-mode polarization of the Cosmic Microwave Background The V-mode polarization of the Cosmic Microwave Background

2009-09-20

arxiv.org/abs/0909.3629v2

Phys.Rev.D 80: 123013,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 4 included figures; minor corrections to match the published version

Scientific paper

The V-mode polarization of the Cosmic Microwave Background is discussed in a weakly magnetized plasma. The VV and VT angular power spectra are computed for adiabatic initial conditions of the Einstein-Boltzmann hierarchy. Depending upon the frequency channel and upon the magnetic field intensity, the VT power spectra of the circular polarization can even be seven orders of magnitude larger than a putative B-mode polarization stemming from the lensing of the primary anisotropies. Specific programs aimed at the direct detection of the V-mode polarization of the Cosmic Microwave Background could provide a new observational tool for the scrutiny of pre-decoupling physics.

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