Abstract
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.
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Crawford, P., Tereno, I. Generalized Observers and Velocity Measurements in General Relativity. General Relativity and Gravitation 34, 2075–2088 (2002). https://doi.org/10.1023/A:1021131401034
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DOI: https://doi.org/10.1023/A:1021131401034