A Method for Detecting Light From The Nearby Past

Mathematics – Probability

Scientific paper

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Scientific paper

When a radio signal is sent to, say, Mars, it is the probability density current that moves through space at a finite speed. Mars is the place where the signal is most likely to be detected (has the highest amplitude) a few minutes after it is emitted. However, there is a nonzero probability of detecting it back on Earth even though the light has moved far away in pre-quantum-mechanical terms. Such a detection would be a signal from the nearby past, equivalent to watching a live television broadcast after the broadcast is over. Because the speed of light in a vacuum is invariant, light from the nearby past can be detected by adapting the techniques of very long baseline interferometry to prepare apparatus for low amplitude photons in Fraunhofer diffraction sidebands.

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