Magnetic fields from cosmological bulk flows

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. We find that, to first order in cosmological perturbations, bulk flows with velocities compatible with current Planck limits ($\beta <8.5\times 10^{-4}$ 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.

arXiv comment5 pages, 4 figures

References in corpus (18)

• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• Evidence for strong extragalactic magnetic fields from Fermi observations of TeV blazars
• Origin of Galactic and Extragalactic Magnetic Fields
• Cosmological Magnetic Fields: Their Generation, Evolution and Observation
• The origin, evolution and signatures of primordial magnetic fields
• A measurement of large-scale peculiar velocities of clusters of galaxies: results and cosmological implications
• The Evolution of Cosmic Magnetic Fields: From the Very Early Universe, to Recombination, to the Present
• Magnetic field generation from cosmological perturbations
• Relaxing the Bounds on Primordial Magnetic Seed Fields
• The 6dF Galaxy Survey: Bulk Flows on $50-70h^{-1}$ Mpc scales
• Planck intermediate results. XIII. Constraints on peculiar velocities
• The seed magnetic field generated during recombination
• Probing the Dark Flow signal in WMAP 9 yr and PLANCK cosmic microwave background maps
• Primordial magnetic fields from metric perturbations
• Challenges for creating magnetic fields by cosmic defects
• Magnetic field spectrum at cosmological recombination revisited
• Constraint on the primordial vector mode and its magnetic field generation from seven-year Wilkinson Microwave Anisotropy Probe Observations
• Non-comoving Cosmology

Cited by in corpus (2)

• Effective field theory of coupled dark energy and dark matter
• Horndeski in motion