Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-03-31
Phys.Rev. D71 (2005) 103006
Astronomy and Astrophysics
Astrophysics
13 pages, submited to Phys. Rev. D
Scientific paper
10.1103/PhysRevD.71.103006
Cosmological magnetic fields induce temperature and polarization fluctuations in the cosmic microwave background (CMB) radiation. A cosmological magnetic field with current amplitude of order $10^{-9}$ G is detectable via observations of CMB anisotropies. This magnetic field (with or without helicity) generates vector perturbations through vortical motions of the primordial plasma. This paper shows that magnetic field helicity induces parity-odd cross correlations between CMB temperature and $B$-polarization fluctuations and between $E$- and $B$-polarization fluctuations, correlations which are zero for fields with no helicity (or for any parity-invariant source). Helical fields also contribute to parity-even temperature and polarization anisotropies, cancelling part of the contribution from the symmetric component of the magnetic field. We give analytic approximations for all CMB temperature and polarization anisotropy vector power spectra due to helical magnetic fields. These power spectra offer a method for detecting cosmological helical magnetic fields, particularly when combined with Faraday rotation measurements which are insensitive to helicity.
;
Kahniashvili Tina
Ratra Bharat
No associations
LandOfFree
Effects of Cosmological Magnetic Helicity on the Cosmic Microwave Background does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effects of Cosmological Magnetic Helicity on the Cosmic Microwave Background, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effects of Cosmological Magnetic Helicity on the Cosmic Microwave Background will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-721365