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Re: Anti-matter

I'm not aware of experimental evidenve of the gravitational properties
of antimatter. Since gravity is so weak this is a very hard experiment
to do. Has it been done and I missed it? Until experiment speaks,
theorists must remind themselves, they really know nothing about
the gravitational properties of antimatter. Nature is under no constraint
to be the way we imagine it should be.

Well, there is some evidence. Some particles are their own
antiparticles. One of these, the photon, seems to have
something like a positive gravitational mass. I believe many
physicists would be very surprised to find antiparticles
with negative gravitational mass.

Leigh