Earlier I wrote:
"Brian Greene's String Particle Theory allows
for 3 "quarks" 2 plus and 1 minus, bound in the proton or
2 minus and 1 plus in the antiproton.
For instance the 1.02 MeVphoton (lambda = hc/E) collides and creates an electron-positron pair
each with a wavelength, lambda = hc/E = the Compton Wavelength, h/mc =
2(pi)r = 2.427e-12 meters, hence the radius ( r ) of the electron or positron (zero width
according to string theory) string-circle or washer-shaped "disk"
particle is 3.86e-13 meters and the radius of each of the ~ 312 MeV circles/washer-disks
in a proton or antiproton with a wavelength, hc/E of 3.98e-15 meters is 6.33e-16 meters or about
1/610 that of the electron.
IOW, as the radius decreases, the mass/energy of a particle goes toward
infinity. "
And with a touch of humor:
"synthesizing a 1.0 kilogram "Antigravity Particle" that can experience 9.8 Newtons
of antigravity force (become weightless) at the earth's surface will only require
c^2 (9.0^16) joules or about 100 milliquads of energy."
Since particles are string circle waves resembling a washer or disk and are only
an inertial mass it might be possible to cage an EM wave in a cavity of sorts circling in
such a manner that it creates a charge +/- q and creates the seemingly "Unified Field"
EM Gravitational Force.
A rough calculation based on prior experience suggests that such an entity, in a hard vacuum,
creating 5.0 "ampere-meters" can exert mimic the gravitational force equivalent
of a kilogram mass at the earth's surface.

