The V-mode polarization of the Cosmic Microwave Background

Abstract

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.

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

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• Circular polarization of the CMB: Foregrounds and detection prospects
• Probing Lorentz-violating electrodynamics with CMB polarization
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A Measurement of Circular Polarization at 40 GHz
• Probing large-scale magnetism with the Cosmic Microwave Background
• Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q Band
• V-mode Polarization in Axion Inflation and Preheating
• Dark energy, integrated Sachs-Wolfe effect and large-scale magnetic fields
• A template of atmospheric O2 circularly polarized emission for CMB experiments
• CMB polarization as a tool to constrain the optical properties of the Universe
• Last scattering, relic gravitons and the circular polarization of the CMB
• Primordial Circular Polarization in the Cosmic Microwave Background
• A circular polarimeter for the Cosmic Microwave Background
• Polarisation of high energy gamma-rays after scattering
• Magnetic field contribution to the last electron-photon scattering
• Spin Hall effect of light in inhomogeneous axion field