On the speed of a test particle inside the Schwarzschild event horizon and other kinds of black holes

Augousti, Andy T., Gusin, Pawel, Kusmierz, Bartosz, Masajada, Jan and Radosz, Andrzej (2018) On the speed of a test particle inside the Schwarzschild event horizon and other kinds of black holes. General Relativity and Gravitation, 50(131), ISSN (print) 0001-7701

Abstract

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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