Primordial Magnetism in CMB B-modes

Abstract

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.

Fig 2 and some typos fixed; 4 pages, 2 figures; to be published in proceedings of Theory Canada 7, Lethbridge, June 7-9, 2012; based on an invited talk by LP

References in corpus (7)

• How to De-Rotate the Cosmic Microwave Background Polarization
• De-Rotation of the Cosmic Microwave Background Polarization: Full-Sky Formalism
• Faraday Rotation Limits on a Primordial Magnetic Field from WMAP Five-Year Data
• Constraining a spatially dependent rotation of the Cosmic Microwave Background Polarization
• Updated constraint on a primordial magnetic field during big bang nucleosynthesis and a formulation of field effects
• Primordial Magnetism in the CMB: Exact Treatment of Faraday Rotation and WMAP7 Bounds
• The Evolution of the Large-Scale Tail of Primordial Magnetic Fields

Cited by in corpus (7)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Stringent Limit on Primordial Magnetic Fields from the Cosmic Microwave Background Radiation
• Consistency of Planck, ACT and SPT constraints on magnetically assisted recombination and forecasts for future experiments
• Constraints on primordial magnetic fields from magnetically-induced perturbations: current status and future perspectives with LiteBIRD and future ground based experiments
• New constraints on cosmic polarization rotation from the ACTPol cosmic microwave background B-Mode polarization observation and the BICEP2 constraint update
• Faraday scaling and the Bicep2 observations
• B-mode Power Spectrum of CMB via Polarized Compton Scattering