An invariant criterion of proximity to the horizon of a black hole

Let a probe dive into a free fall from a mother craft hovering over a black hole. Let the mother craft regularly send standard signals to the probe. The net frequency shift due to both the gravitational and Doppler effects is calculated for the signals received by the probe. The shift is found to be a red one and it assumes a universal value z=1/2 as the probe approaches the horizon.

Authors
Mitskievic N.V. 1 , Nesterov A.I.
Number of issue
2
Language
English
Pages
L45-L47
Status
Published
Number
003
Volume
8
Year
1991
Organizations
  • 1 Dept. of Theor. Phys., Peoples' Friendship Univ., Moscow, Russian Federation
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