期刊
GENERAL RELATIVITY AND GRAVITATION
卷 50, 期 10, 页码 -出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10714-018-2445-6
关键词
Schwarzschild spacetime; Black hole; Velocity; Speed; Signal exchange; Event horizon; General relativity
We present the results of an investigation of the speed of a radially infalling test particle crossing the event horizon of a black hole within a Schwarzschild spacetime. One finds that the speed as measured by a special class of observers, at rest outside the horizon and static inside the horizon, increases when the test particle approaches the horizon but decreases inside the horizon. The corresponding situation regarding black holes possessing both outer and inner horizons is also briefly discussed.
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