MOTIVATIONS FOR ANTIGRAVITY IN GENERAL-RELATIVITY

We present arguments showing that it is natural to interpret the negat ive mass part of the Kerr solution as representing the geometry experi enced by antimatter. The C, P and T discrete transformations are consi dered for this geometry. The C and T properties of the proposed identi fication are found to be in agreement with the usual representation of antimatter. In addition, we conjecture a property of perfect stigmati sm through Kerr wormholes which allows General Relativity to mimic ant igravity. Kerr wormholes would then act as ''super-mirrors'' reversing the C, P and T images of an object seen through it. This interpretati on is subject to several experimental tests and able to provide an exp lanation, without any free parameter, of the ''CP'' violation observed in the neutral kaon system.