Black Hole Beacon: Gravitational Lensing

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A. A. Jackson (2015), JBIS, 68, pp.342-346

Refcode: 2015.68.342
Keywords: Black holes, interstellar communications

Abstract:
This paper describes a beacon that uses laser transmitters and a non-rotating black hole as a beacon deployed by an advanced civilization. The idea that advanced civilizations may seek a way to communicate in optimum ways (Benford and Benford, 2010 [3]) has been put forward in recent times. In what manner could a civilization use a gravitational lens to augment laser transmitters used as a beacon? It is shown that an infrared laser transmitter of one Watt can reach a range of at least one kilo parsec when there is a caustic crossing on the optical axis. This is the problem considered here.

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