Brad I think it is safe to say there is a graviton at the exact center
of every particle.(Planck mass) I could go further staying with Feynman
and Wheeler,that the graviton has to exist in the infinite energy of the
universe,and that includes the intrinsic energy of space. These
thoughts I have had since 1946 when I wrote G=EMC^2 on a brown paper bag
while riding the Boston's EL(electric train) Bert