There is a conundrum in modern physics which may be more simple to resolve than at first glance. The problem has been to integrate gravity into the unified field. The problem it seems has not been so much a mathematical problem as a conceptual one. We know that energy and matter are interchangeable, so if we ignore matter in our thought experiment then we can easily determine what gravity is. For all bodies gravity acts as point source at the centre of the body. If we take a large mass like a planet and just view it as an energy field then we can see that its' gravity would be associated with the energy field. Then if we view an individual atom in space then we can visualize it as an energy field associated with a tiny gravity well. The gravity then is a point source at the centre of the atom creating a wave structure which diminishes by the distance squared. In other word the graviton is created at the centre of the atom by the presence of the energy field.
Gravity is very weak, but it has the peculiar characteristic to diminish by the distance squared, which makes its' influence felt, even if very tiny at great distances, as it never diminishes to an absolute zero in magnitude. In the case of a planet the energy field of the planet is the mass of the planet and the graviton drops to the centre of the collective energy field. The graviton then is both particle and wave and when various particles meet and create a body the graviton falls to the centre of the collective energy field. In every case with various bodies there is only one graviton as the graviton itself has no mass and is only the product of the energy fieled which creates a "dimple" in space time whose curvature is such that it appears to diminish with the distance squared. As it is also a wave the wave moves outward through the body and if we observe an individual atom it appears to have gravity, but this is due to the Heisenburg principle of uncertainty when you take the mas of the atom you see the gravity as a particle, but just as an electron can pass through two slits at the same time, there is only one wave.
As a result of the true nature of gravity the unified field is really at hand. The problem has been that the researchers have been trying to reconcile gravity as a force, but it is not a force, but rather just the warpage of space time due to the presence of energy. If we take three discrete particles and observe them they each will have a separate mass and each has a graviton. If we then combine the particles into a molecule then they do not have separate masses, rather only a combined mass and now there is only one graviton at the centre of the molecule. The presence of the molecules energy in space time warps the matrix. The energy field is the gravity. The problem with thinking that gravity is a force started with Kepler who thought of gravity as a similar force to magnetism, which stuck. Magnetism, however is a dipole and gravity is a monopole. It has no preferred orientation like magnetism and no north and south poles.
When we take gravity in it's extreme as in a black hole then we can more fully understand what gravity is. When the stellar mass of the black hole collapses it is due to the fact that the outward pressure of the nuclear reactions at the stars core ceases and can no longer resist the inward acceleration of the stars energy toward the centre of the star. The graviton then is observed as accelerating further into the centre of the star and the energy field collapses. When the energy collapses beyond the point where the neutrons combine with the protons of the individual atoms the energy field can no longer be considered to be of an atomic nature and the individual atoms then collapse into a generalized energy field. This energy field then chases the accelerating graviton as if it were travelling through space, but in fact it is accelerating towards a point of singularity which it can never achieve. Thus the acceleration of the energy towards the point of singularity never ends as always out paces the acceleration of the energy towards the centre of the star. The energy is always constrained by the speed of light, which it cannot exceed.
Then there only three forces, the strong, the weak and electromagnetism. When we combine atoms then their combined fields warp space time due to the three force which bind them together. A body acts similar to a lens, but instead of light being focussed it is space time. The energy of the atom always wants to radiate outwards, but the nuclear forces and electromagnetism won't let them expand. The proton, for example is in a state of balance between the pressure of the energy pushing outwards and the binding energy of the strong force which holds them together. In a black hole the individual nuclear particles combine into a generalized energy field which bends space and time due to the fact that now the star has become a single particle and has so warped space time that even the speed of light is too slow to counteract the inward acceleration due to the strong force.
For every discrete body there is only one graviton. The graviton always remains massless no matter how massive the body is. If we apply this principle to the Grand Unified Theory when the strong and weak forces combine, as in a black hole the graviton always remains separate and never unifies as it merely product of the unified forces as they warp space time to to their presence in the matrix. In a large body, such as a planet the graviton is a point source at the centre of the body and also a wave that travels through out space time instantaneously. When matter manifested at the first moment of the Big Bang the graviton came into existence as result of the matters' presence. When we remove a particle from a large mass and examine it we observe the position of the particle and thus the graviton. If we do not observe the particle the graviton does not exist in the particle, but merely is a wave of uncertain location.
We can then re-write the gravitation equation as the sum of the combined strong forces of all the electromagnetically combined particles that make up the body. Gravity is not then a force, but rather the sum of the strong forces' trying to collapse the body to a singularity. What keeps the body from collapsing into a singularity is the outward pressure of the energy of the individual particles, just as in a star the outward pressure of the nuclear reactions at the core balance the inward acceleration of the strong force, which if unbalanced results in a black hole.