Tensor microwave anisotropies from a stochastic magnetic field

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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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 non-linear 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 10-9 G. If we assume that the magnetic field is damped below the Alfvén damping scale, we find that its amplitude at 0.1h-1 Mpc, Bλ, is constrained to be Bλ<7.9×10-6e3n G, for n<-3/2, and Bλ<9.5×10-8e0.37n G, for n>-3/2, where n is the spectral index of the magnetic field and H0=100h km s-1 Mpc-1 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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