Planck showed in 1899 the quantum or particle nature of light by equating light frequency to the energy of photon particles. Einstein later showed in 1905 that the equivalence of matter and energy also meant that matter was equivalent to frequency as well. The notion of matter oscillating just like light is really the basis of quantum charge and that matter frequency is equivalent to its mass.
The final assumption that resolves the quantum gravity puzzle is a similarly simple assumption as the equivalence of matter and energy. The further simple assumption of the equivalence of the simplest quantum matter particle and the energy and frequency of the universe. The assumption that the energy of the universe is equivalent to its frequency means that there is a very slow acceleration of light over cosmic time. A very slow light acceleration means also that while static matter results in simple gravity, moving matter results in a gravity vector force, which then unifies quantum gravity and charge with light acceleration. Just as moving charges couple to each other with magnetism, moving matter decays couple to each other with gravitization, which is the quantum gravity vector force of dark matter. The matter decay of stars as radiation couples them together with gravitization just as moving charges couple as magnetism.
Einstein showed that the speed of light does not depend on source velocity, but he never considered the possibility of light accelerating over time because the speed of light essentially defines the atomic time of relativistic rest mass. While the speed of light does not change with source velocity, the acceleration of light does slow with increasing source velocity. Instead of the speed of light and atomic time being constant, light accelerates very slowly over universe time and atomic time increases very slowly over a universe time. The acceleration of light means that the equivalence of matter decay and force growth is the primal axiom of all changes in the universe.
As opposed to atom time of rest mass, which is proportional to the speed of light and photon frequencies, universe cosmic time is from the universal decay frequency of quantum matter, mae/hae = 1.18e-18s-1, the aether particle mass divided by the matter-scaled Planck constant, hae = h/c2. The universe mass shell is then a wave function collapsing into our reality at that very, very slow frequency. Accelerating light and force does mean that atomic clocks also accelerate in universe cosmic time. Universe cosmic time is the universal aether decay frequency, which ticks at the very slow rate of aether decoherence and universe mass shell collapse.
From the equivalence of mass and energy, it necessarily follows that the speed of light does not depend on source velocity. The acceleration of light through space and over universe time does mean that the same light that we see now moved more slowly in the past. Since forces were also weaker in the past, light from distant galaxies is therefore red largely because of time and not because of expanding velocity red shifts. In fact, the universe mass shell is shrinking not growing even while the matter action universe forces are growing along with the speed of light.
Light accelerates over universe cosmic time and so atomic time also accelerates over universe cosmic time and and that acceleration unifies charge and gravity into a common matter action causal set. Light acceleration is therefore completely consistent with gravity relativity since both space and atom time emerge from matter action. Gravity is an exchange of biphoton quadrupoles just like charge is an exchange of photon dipoles.