Kosowsky, Arthur and Kahniashvili, Tina and Lavrelashvili, George and Ratra, Bharat (2005) Faraday rotation of the cosmic microwave background polarization by a stochastic magnetic field. Physical review D, 71.

Text
kklr05.pdf Download (384kB)  Preview 
Abstract
A primordial cosmological magnetic field induces Faraday rotation of the cosmic microwave background polarization. This rotation produces a curltype polarization component even when the unrotated polarization possesses only gradienttype polarization, as expected from scalar density perturbations. We compute the angular power spectrum of curltype polarization arising from small Faraday rotation due to a weak stochastic primordial magnetic field with a powerlaw power spectrum. The induced polarization power spectrum peaks at arc minute angular scales. Faraday rotation is one of the few cosmological sources of curltype polarization, along with primordial tensor perturbations, gravitational lensing, and the vector and tensor perturbations induced by magnetic fields; the Faraday rotation signal peaks on significantly smaller angular scales than any of these, with a power spectrum amplitude which can be comparable to that from gravitational lensing. Prospects for detection are briefly discussed.
Item Type:  Article 

Subjects:  Q Science > QB Astronomy Q Science > QC Physics 
Depositing User:  Prof. Tina Kahniashvili 
Date Deposited:  30 Jan 2014 12:39 
Last Modified:  27 Mar 2015 06:58 
URI:  http://eprints.iliauni.edu.ge/id/eprint/736 
Actions (login required)
View Item 