Author: Fenu Elisa Pitrou Cyril Maartens Roy
Publisher: Oxford University Press
ISSN: 0035-8711
Source: Monthly Notices of the Royal Astronomical Society, Vol.414, Iss.3, 2011-07, pp. : 2354-2366
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Abstract
ABSTRACTNon-linear dynamics creates vortical currents when the tight-coupling approximation between photons and baryons breaks down around the time of recombination. This generates a magnetic field at second order in cosmological perturbations, whose power spectrum is fixed by standard physics, without the need for any ad hoc assumptions. We present the fully general relativistic calculation of the magnetic power spectrum, including the effects of metric perturbations, second-order velocity and photon anisotropic stress, thus generalizing and correcting previous results. We also show that significant magnetogenesis continues to occur after recombination. The power spectrum decays as
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