On the behaviour of radiation near massive bodies

Abstract

The problem of communication between an observer on the surface of a massive body and an externa 1 Schwarzschild observer is examined. It is shown that when the body is freely imploding a signal from the external observer never reaches the surface provided the Schwarzschild coordinate of the external observer exceeds a critical value depending on the mass and radius of the body. The signals that reach the surface are redshifted. Time reversal of the solution then shows that radiation from an exploding massive body will be blueshifted when it reaches an external observer. This effect may supply the explanation for the origin of high-energy particles and quanta.