RT Journal Article
T1 Magnetic fields from cosmological bulk flows
A1 Ruiz Cembranos, José Alberto
A1 López Maroto, Antonio
A1 Villarrubia Rojo, Héctor
AB 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.
PB Oxford Univ Press
SN 0035-8711
YR 2020
FD 2020-09
LK https://hdl.handle.net/20.500.14352/6704
UL https://hdl.handle.net/20.500.14352/6704
LA eng
NO © 2020 Oxford Univ Press.This work has been supported by the Ministerio de Economia (MINECO, Spain) project FIS2016-78859-P(AEI/FEDER,UE).
NO Ministerio de Economía y Competitividad (MINECO)/AEI/FEDER
DS Docta Complutense
RD 10 abr 2025