General Relativity and Gravitation

, Volume 31, Issue 1, pp 91–105

The Gravitational Interaction of Light: From Weak to Strong Fields

  • V. Faraoni
  • R. M. Dumse

DOI: 10.1023/A:1018867405133

Cite this article as:
Faraoni, V. & Dumse, R.M. General Relativity and Gravitation (1999) 31: 91. doi:10.1023/A:1018867405133


An explanation is proposed for the fact thatpp-waves superpose linearly when they propagateparallelly, while they interact nonlinearly, scatter andform singularities or Cauchy horizons if they areantiparallel. Parallel pp-waves do interact, but ageneralized gravitoelectric force is exactly cancelledby a gravitomagnetic force. In an analogy, theinteraction of light beams in linearized generalrelativity is also revisited and clarified, a new result isobtained for photon to photon attraction, and aconjecture is proved. Given equal energy density in thebeams, the light-to-light attraction is twice thematter-to-light attraction and four times the matter-to-matterattraction.

Superposition of pp-waves

Copyright information

© Plenum Publishing Corporation 1999

Authors and Affiliations

  • V. Faraoni
    • 1
    • 2
  • R. M. Dumse
    • 1
  1. 1.RggR, Faculté des Sciences, Campus PlaineUniversité Libre de BruxellesBruxellesBelgium
  2. 2.New Micros Inc.DallasUSA