Effects of helical magnetic fields on the cosmic microwave background

Details Effects of helical magnetic fields on the cosmic microwave background Effects of helical magnetic fields on the cosmic microwave background

2011-12-20

arxiv.org/abs/1112.4797v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

22 pages, 14 figures

Scientific paper

A complete numerical calculation of the temperature anisotropies and polarization of the cosmic microwave background (CMB) in the presence of a stochastic helical magnetic field is presented which includes the contributions due to scalar, vector and tensor modes. The correlation functions of the magnetic field contributions are calculated numerically including a Gaussian window function to effectively cut off the magnetic field spectrum due to damping. Apart from parity-even correlations the helical nature of the magnetic field induces parity-odd correlations between the E- and B-mode of polarization (EB) as well as between temperature (T) and the polarization B-mode (TB).

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