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Primordial Magnetism in CMB B-modes

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arxiv 1210.0308 v2 pith:JA34CL2N submitted 2012-10-01 astro-ph.CO gr-qc

Levon Pogosian , Tanmay Vachaspati , Amit Yadav This is my paper · ORCID
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keywords primordialb-modesfieldsmagneticbecausecorrelationsinducedmagnetism
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Cosmic Microwave Background (CMB) polarization B-modes induced by Faraday Rotation (FR) can provide a distinctive signature of primordial magnetic fields because of their characteristic frequency dependence and because they are only weakly damped on small scales. FR also leads to mode-coupling correlations between the E and B type polarization, and between the temperature and the B-mode. These additional correlations can further help distinguish magnetic fields from other sources of B-modes. We review the FR induced CMB signatures and present the constraints on primordial magnetism that can be expected from upcoming CMB experiments. Our results suggest that FR of CMB will be a promising probe of primordial magnetic fields.

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  1. B-mode Power Spectrum of CMB via Polarized Compton Scattering

    astro-ph.CO 2019-09 conditional novelty 5.0 of 10

    Compton scattering off partially polarized electrons can generate B-mode polarization from scalar density perturbations, with an amplitude proportional to the square of the electron polarization asymmetry.

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