Dark energy, non-minimal couplings and the origin of cosmic magnetic fields

Abstract

In this work we consider the most general electromagnetic theory in curved space-time leading to linear second order differential equations, including non-minimal couplings to the space-time curvature. We assume the presence of a temporal electromagnetic background whose energy density plays the role of dark energy, as has been recently suggested. Imposing the consistency of the theory in the weak-field limit, we show that it reduces to standard electromagnetism in the presence of an effective electromagnetic current which is generated by the momentum density of the matter/energy distribution, even for neutral sources. This implies that in the presence of dark energy, the motion of large-scale structures generates magnetic fields. Estimates of the present amplitude of the generated seed fields for typical spiral galaxies could reach $10^{-9}$ G without any amplification. In the case of compact rotating objects, the theory predicts their magnetic moments to be related to their angular momenta in the way suggested by the so called Schuster-Blackett conjecture.

5 pages, no figures

References in corpus (12)

• Evidence for strong extragalactic magnetic fields from Fermi observations of TeV blazars
• On the Origin of Cosmic Magnetic Fields
• Evidence for Gamma-Ray Halos Around Active Galactic Nuclei and the First Measurement of Intergalactic Magnetic Fields
• Large-scale magnetic fields in the inflationary universe
• Cosmological Magnetic Field: a fossil of density perturbations in the early universe
• On the divergences of inflationary superhorizon perturbations
• The curvature perturbation in a box
• Cosmological magnetic fields from inflation in extended electromagnetism
• Perturbations in electromagnetic dark energy
• Origin of $10^{15}-10^{16}$G Magnetic Fields in the Central Engine of Gamma Ray Bursts
• Magnetic Field Spectrum at Cosmological Recombination
• Causality and Superluminal Light

Cited by in corpus (17)

• On the consistency of universally non-minimally coupled $f(R,T,R_{\mu \nu }{T}^{\mu \nu })$ theories
• Spacetimes with vector distortion: Inflation from generalised Weyl geometry
• On the 4D generalized Proca action for an Abelian vector field
• Cosmology for quadratic gravity in generalized Weyl geometry
• Einstein-Vector Gravity, Emerging Gauge Symmetry and de Sitter Bounce
• Reissner-Nordstrom Black Holes in the Inverse Electrodynamics Model
• Generation of large-scale magnetic fields, non-Gaussianity, and primordial gravitational waves in inflationary cosmology
• Magnetogenesis in bouncing cosmology
• Generation of large-scale magnetic fields from inflation in teleparallelism
• Cosmic magnetization in curved and Lorentz violating space-times
• Model of inflationary magnetogenesis
• Large-scale magnetic fields from inflation due to a $CPT$-even Chern-Simons-like term with Kalb-Ramond and scalar fields
• Cosmology with vector distortion
• Cosmological Ohm's law and dynamics of non-minimal electromagnetism
• Counterterm method and thermodynamics of Hairy Black Holes in a Vector-Tensor theory with Abelian gauge symmetry breaking
• Cosmic magnetic fields and dark energy in extended electromagnetism
• Primordial Magnetic Field from Gravitationally Coupled Electrodynamics in Bouncing Scenario