par Faraoni, Valerio 
;Dumse, R.M.
Référence General relativity and gravitation, 31, 1, page (91-105)
Publication Publié, 1999-01
;Dumse, R.M.Référence General relativity and gravitation, 31, 1, page (91-105)
Publication Publié, 1999-01
Article révisé par les pairs
| Résumé : | An explanation is proposed for the fact that pp-waves superpose linearly when they propagate parallelly, while they interact nonlinearly, scatter and form singularities or Cauchy horizons if they are antiparallel. Parallel pp-waves do interact, but a generalized gravitoelectric force is exactly cancelled by a gravitomagnetic force. In an analogy, the interaction of light beams in linearized general relativity is also revisited and clarified, a new result is obtained for photon to photon attraction, and a conjecture is proved. Given equal energy density in the beams, the light-to-light attraction is twice the matter-to-light attraction and four times the matter-to-matter attraction. |
