Durrer, Ruth and Ferreira, Pedro and Kahniashvili, Tina (2000) Tensor microwave anisotropies from a stochastic magnetic field. Physical review D, 61.

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Abstract
We derive an expression for the angular power spectrum of cosmic microwave background anisotropies due to gravity waves generated by a stochastic magnetic field and compare the result with current observations; we take into account the nonlinear nature of the stress energy tensor of the magnetic field. For almost scale invariant spectra, the amplitude of the magnetic field at galactic scales is constrained to be of order 109 G. If we assume that the magnetic field is damped below the Alfvén damping scale, we find that its amplitude at 0.1h1 Mpc, Bλ, is constrained to be Bλ<7.9×106e3n G, for n<3/2, and Bλ<9.5×108e0.37n G, for n>3/2, where n is the spectral index of the magnetic field and H0=100h km s1 Mpc1 is the Hubble constant today.
Item Type:  Article 

Subjects:  Q Science > QC Physics 
Depositing User:  Prof. Tina Kahniashvili 
Date Deposited:  30 Jan 2014 12:33 
Last Modified:  27 Mar 2015 06:52 
URI:  http://eprints.iliauni.edu.ge/id/eprint/730 
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