The theory explains Quantum Gravity as the result of two opposing pushing force photons, the vacuum Dark Energy Axions (6 below) and the Fermionic produced Graviton (also pushing but less powerful,(3 below) both resulting into the Newtonic Fallen Apple gravity.
The Standard Model (SM) of physics is a theory of the elementary particles, which are either fermions or bosons. It also explains three of the four basic forces of nature. The four fundamental forces are: gravity, electromagnetism, the weak force, and the strong force. Gravity is the one the model does not explain.