Generating Electromagnetic Waves from Gravity Waves in Cosmology

TL;DR

This paper demonstrates how gravitational waves in cosmological models can generate electromagnetic waves through their interaction with magnetic fields, providing a theoretical basis for such phenomena in the universe.

Contribution

It constructs explicit models of electromagnetic wave generation from gravitational waves in FLRW universes, confirming previous theoretical predictions.

Findings

Electromagnetic waves can be generated from gravitational waves in cosmological backgrounds.

The coupling mechanism involves gravitational waves interacting with magnetic fields.

The results support the possibility of observing electromagnetic signals from gravitational wave sources in the universe.

Abstract

Examples of test electromagnetic waves on a Friedmann-Lemaitre-Robertson-Walker(FLRW) background are constructed from explicit perturbations of the FLRW space-times describing gravitational waves propagating in the isotropic universes. A possible physical mechanism for the production of the test electromagnetic waves is shown to be the coupling of the gravitational waves with a test magnetic field, confirming the observation of Marklund, Dunsby and Brodin [Phys.Rev. D62,101501(R) (2000)].