The Physical Reality Underlying the Relativistic Mechanics and the   Gravitational Interaction
  In the present paradigm the space is filled with very high flux of very small quanta whose wavelength equals the Planck's length. The quantum energy is very small, so the relevant Planck constant ho is much smaller than the usual h. This physical paradigm imposes to the motion the conservation of energy and momentum, as well as the laws of the relativistic mechanics. The strong version of the equivalence principle, which requires both inertia and gravitation come from a unique phenomenon, is the relevant test to verify the physical reality of the cosmic quanta. Through Compton's interaction each quantum colliding two masses gives them a little momentum which produces a newtonian force pushing the masses each towards other. The constant G depends on the quanta characteristics, so the Newton's gravitational mass does no longer holds. The new gravitational force of stars depends on the reducing quantum energy, so G multiplies by a gravity factor (greater than 1) depending on the star density. The highest number (200-300) pertains to the neutron stars, which increment notably their accretion capacity. This property may explain the mistery of the obscure supermassive bodies whose gravitational effects rise up to 3.7 million times the Sun effects. Current theories do not give a convincing explanation of this phenomenon. 
Maurizio Michelini