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CMB anisotropies generated by a stochastic background of primordial magnetic fields with non-zero helicity

Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Date Issued
2015
Author(s)
•
•
DOI
Abstract
We consider the impact of a stochastic background of primordial magnetic fields with non-vanishing helicity on CMB anisotropies in temperature and polarization. We compute the exact expressions for the scalar, vector and tensor part of the energy-momentum tensor including the helical contribution, by assuming a power-law dependence for the spectra and a comoving cutoff which mimics the damping due to viscosity. We also compute the parity-odd correlator between the helical and non-helical contribution which generate the TB and EB cross-correlation in the CMB pattern. We finally show the impact of including the helical term on the power spectra of CMB anisotropies up to multipoles with l ~ Script O(103).
Volume
2015
Issue
10
Start page
031
Uri
Url
Issn Identifier
1475-7516
Ads BibCode
2015JCAP...10..031B
Rights
open.access
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