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

http://arxiv.org/abs/1412.1836


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 ell ~ O(10^3)$.

Read this paper on arXiv…

M. Ballardini, F. Finelli and D. Paoletti
Mon, 8 Dec 14
60/61

Comments: 24 pages, 29 figures