Gravitational wave amplification of seed magnetic fields
arXiv:astro-ph/0112560 · doi:10.1016/S0370-2693(03)00415-5
Abstract
We discuss how gravitational waves could amplify seed magnetic fields to strengths capable of supporting the galactic dynamo. We consider the interaction of a weak magnetic field with gravity wave distortions in almost FRW cosmologies and find that the magnitude of the original field is amplified proportionally to the wave induced shear anisotropy and, crucially, proportionally to the square of the field's initial scale. The latter makes our mechanism particularly efficient when operating on superhorizon sized magnetic fields, like those produced during inflation. In that case, the achieved amplification can easily boost magnetic strengths, which may still lie relatively close to the galactic dynamo lower limits, well within the currently accepted range.
Revised version, to appear in Phys. Lett. B
References in corpus (8)
- Origin of Galactic and Extragalactic Magnetic Fields
- Galactic and extragalactic magnetic fields
- Natural Magnetogenesis from Inflation
- Milestones in the Observations of Cosmic Magnetic Fields
- Noncommutativity in Space and Primordial Magnetic Field
- Self consistent estimates of magnetic fields from reheating
- Magnetized gravitational waves
- Gravitational waves and cosmic magnetism; a cosmological approach
Cited by in corpus (28)
- Cosmology with inhomogeneous magnetic fields
- Electromagnetic fields in curved spacetimes
- Vector modes generated by primordial density fluctuations
- Superadiabatic-type magnetic amplification in conventional cosmology
- Primordial magnetic fields and gravitational baryogenesis in nonlinear electrodynamics
- Gauge field back-reaction in Born Infeld cosmologies
- Resonant amplification of magnetic seed fields by gravitational waves in the early universe
- The general relativistic MHD dynamo equation
- Cosmic magnetic fields from velocity perturbations in the early Universe
- Gravitational, shear and matter waves in Kantowski-Sachs cosmologies
- Primordial magnetic seed field amplification by gravitational waves
- Superhorizon magnetic fields
- On inhomogeneous magnetic seed fields and gravitational waves within the MHD limit
- Gravito-magnetic amplification in cosmology
- Limits on stochastic magnetic fields: A defense of our paper [1]
- Interaction between gravitational waves and plasma waves in the Vlasov description
- Nonlinear electrodynamics and CMB polarization
- Primordial magnetic seed field amplification by gravitational waves: comment on gr-qc/0503006
- Flavon Magneto-Baryogenesis
- Interactions of cosmological gravitational waves and magnetic fields
- Non-linear Electrodynamics in Blandford-Znajeck Energy Extraction
- Response to ``Comment on `Primordial magnetic seed field amplification by gravitational waves' "
- Cosmic Electromagnetic Fields due to Perturbations in the Gravitational Field
- Parametric amplification of electromagnetic plasma waves in resonance with a dispersive background gravitational wave
- On the Interaction Between Electromagnetic, Gravitational, and Plasma Related Perturbations on LRS Class II Spacetimes
- Electromagnetic signatures of far-field gravitational radiation in the 1+3 approach
- A numerical study of primordial magnetic field amplification by inflation-produced gravitational waves
- Cosmological perturbations in Energy-Momentum Squared Gravity