General Relativity and Gravitation

, Volume 34, Issue 12, pp 2075–2088 | Cite as

Generalized Observers and Velocity Measurements in General Relativity

  • Paulo Crawford
  • Ismael Tereno


To resolve some unphysical interpretations related to velocity measurements by static observers, we discuss the use of generalized observer sets, give a prescription for defining the speed of test particles relative to these observers, and show that, for any locally inertial frame, the speed of a freely falling material particle is always less than the speed of light at the Schwarzschild black hole surface.

Reference frames Schwarzschild space-time velocity 


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Copyright information

© Plenum Publishing Corporation 2002

Authors and Affiliations

  • Paulo Crawford
    • 1
  • Ismael Tereno
    • 2
  1. 1.Departamento de Física da Faculdade de Ciências da Universidade de LisboaCentro de Astronomia e Astrofísica andLisboaPortugal
  2. 2.Departamento de Física da Faculdade de Ciências da Universidade de LisboaInstitut d'Astrophysique de ParisParisFrance

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