Publication: Magnetic fields from cosmological bulk flows
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2020-09
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Oxford Univ Press
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Abstract
We explore the possibility that matter bulk flows could generate the required vorticity in the electron-proton-photon plasma to source cosmic magnetic fields through the Harrison mechanism. We analyze the coupled set of perturbed Maxwell and Boltzmann equations for a plasma in which the matter and radiation components exhibit relative bulk motions at the background level. These background bulk motions induce a relative velocity between the matter and cosmic microwave background rest frames at the present time, i.e. a bulk flow, with an amplitude beta. We find that, to first order in cosmological perturbations, bulk flows with velocities compatible with current Planck limits (beta<8.5 x 10(-4) at 95% CL) could generate magnetic fields with an amplitude 10(-21) G on 10 kpc comoving scales at the time of completed galaxy formation which could be sufficient to seed a galactic dynamo mechanism.
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© 2020 Oxford Univ Press.
This work has been supported by the Ministerio de Economia (MINECO, Spain) project FIS2016-78859-P(AEI/FEDER,UE).