Beestie: from here
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A GRAVITOMAGNETIC FIELD , according to the theory of general relativity, arises from moving matter (matter currents) just as an ordinary magnetic field arises from moving charges (electrical currents). The analogy is so apt that the equations describing this "magnetic" component of gravity can essentially be adapted from Maxwell's equations for electromagnetism by replacing the charge density with the mass density and the charge current with the mass current. The rotating Earth, containing a lot of matter in motion, is the source of such a very weak gravitomagnetic force...
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I would guess that the real issue here is our understanding of the physics of superconductors. GEM is usually stated as being only valid under certain conditions -- far from isolated sources (so they can be treated as "points") and for slowly-moving (nonrelativistic) particles. I don't see why superconductor experiments should be expected to conform to the classical values expected for the simple cases.
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per·son \ˈpər-sən\ (noun) - an ephemeral collection of small, irrational decisions
The fun thing about evolution (and science in general) is that it happens whether you believe in it or not.
Last edited by Pie; 03-27-2006 at 11:50 AM.
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