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I don't really know much more than has been entered i the topic
already. The results of recent versions of the Eotvos experiment have
been mixed, sometimes showing additional forces, sometimes not. My
impressions is that they show the additional forces more often than
not.
Two points of information:
"Baryon number," for everyday purposes, is the number of protons and
neutrons in a given system. As I recall, the person who dusted off the
Eotvos experiment theorized that the fifth force was proportional to
the baryon number of the elements making up the gravitating body. So
ten tons of hydrogen would have much less fifth-force pull (or push)
than ten tones of carbon, which would have less than ten tons of lead.
The other interesting point is that these 5th and 6th forces, if they
exist, seem to have a range of only a few hundred yards. This is quite
unlike the four well-known forces (electromagnetic, gravitational,
strong nuclear and weak nuclear). The electromagnetic and
gravitational forces have, so far as is known, an infinite range.
There is no distance they can't reach across, though they grow steadily
weaker with distance. The two nuclear forces are essentially contact
forces -- that is, they operate across atomic-scale distances
comparable to the width of a proton.
Earl Wajenberg
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For further reference, there's an article in this month's (April)
Scientific American on the effects of gravity on antiparticles.
Covers the fifth and sixth forces, etc.
At this time, experiments are inconclusive (some show the forces,
some don't), but further tests are proposed.
Ed E. (just passing through)
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