reply to post by K_OS
Einstein's gravitational field equations can be written as:
Rmn - 1/2 gmnR + a gmn = k Tmn
where Rmn is the Riemann curvature tensor, R is its contraction, and gmn is the metric tensor. m and n are indices ranging from 1 to 4 (in the usual
4 dimensional space-time continuum). The left-hand side of the equation describes the geometry of space-time. On the right-hand side Tmn is the
Energy tensor. The right-hand side describes the energy content within space-time. The letter k is Einstein's gravitational constant, which is
related to Newton's gravitational constant.
The letter a is the cosmological constant. It is a very small negative number, which acts as a repulsive force for very large galactic separations.
This is one expression of ant-gravity.
Another expression of anti-gravity can be had by taking Einsteins gravitational coupling constant k, and replacing it with -k.
Anti-gravity in the laboratory, it would seem, rests on finding ways to manipulate the gravitational constant k such that it is no loner a simple
constant, but depends on position. Perhaps this may be accomlished by introducing very strong asymmetric electomagnetic fields using spinning
superconductors. This then takes us into the realm of Classical Unified Field Theory, which was an active field of investigation until Einstein's
death in 1955.
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