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Voting closed: 13/01/2015 23:08:03
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Assuming that a particle and its antiparticle have the gravitational charge of the opposite sign...
This is to do with the hypothesis that anti-matter may be repelled by gravity. I don't think anyone has tested this yet.
As there is assumed to be more matter than anti-matter the effects on light would likely be negligible anyway. Personally I don't believe that anti-matter will react any differently to matter in a gravitational field. The sign of charge of the proton and electron don't cause any difference.
If anti-matter were repulsed by gravity, however, it may answer the question as to why matter won out in the annihilation process.
This does not seem to fit the observed distribution of dark matter in the solar system. It can be seen that dark matter is denser in the inner solar system and there are density peaks associated with the inner planets. It seems more like WIMPS to me.