Carroll symmetry of plane gravitational waves
Résumé
The well-known 5-parameter isometry group of plane gravitational waves in $4$ dimensions is identified as Levy-Leblond's Carroll group in $2+1$ dimensions with no rotations. Our clue is that plane waves are Bargmann spaces into which Carroll manifolds can be embedded. We also comment on the scattering of light by a gravitational wave and calculate its electric permittivity considered as an impedance-matched metamaterial.
Domaines
Physique mathématique [math-ph]| Origine | Fichiers produits par l'(les) auteur(s) |
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