Derives first-order EM perturbation equations from covariant Maxwell equations in GW backgrounds, shows equivalence of formulations, and calculates that typical GW strains of 10^{-21} induce EM responses of order 10^{-19} relative to incident fields.
Electromagnetic fields in curved spacetimes
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abstract
We consider the evolution of electromagnetic fields in curved spacetimes and calculate the exact wave equations of the associated electric and magnetic components. Our analysis is fully covariant, applies to a general spacetime and isolates all the sources that affect the propagation of these waves. Among others, we explicitly show how the different parts of the gravitational field act as driving sources of electromagnetic disturbances. When applied to perturbed FRW cosmologies, our results argue for a superadiabatic-type amplification of large-scale cosmological magnetic fields in Friedmann models with open spatial curvature.
fields
gr-qc 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
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First-Order Perturbations of Covariant Maxwell Equations in Gravitational Waves
Derives first-order EM perturbation equations from covariant Maxwell equations in GW backgrounds, shows equivalence of formulations, and calculates that typical GW strains of 10^{-21} induce EM responses of order 10^{-19} relative to incident fields.