CMB B-modes from Faraday Rotation

Details CMB B-modes from Faraday Rotation CMB B-modes from Faraday Rotation

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ascl.soft06018p&link_type=abstract

Astrophysics Source Code Library, record ascl:1106.018

Astronomy and Astrophysics

Astrophysics

Scientific paper

This code is a quick and exact calculator of B-mode angular spectrum due to Faraday rotation by stochastic magnetic fields. Faraday rotation induced B-modes 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, allowing them to dominate B-modes from other sources. By numerically solving the full CMB radiative transport equations, we study the B-mode power spectrum induced by stochastic magnetic fields that have significant power on scales smaller than the thickness of the last scattering surface. Constraints on the magnetic field energy density and inertial scale are derived from WMAP 7-year data, and are stronger than the big bang nucleosynthesis (BBN) bound for a range of parameters. Observations of the CMB polarization at smaller angular scales are crucial to provide tighter constraints or a detection.

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