Quantum Field Theory joins ideas from quantum theory and special relativity. There are multiple field theories that apply to different forces:
| Theory | Force |
|---|---|
| QED: Quantum Electrodynamics | Electromagnetic force |
| QCD: Quantum Chromodynamics | Strong nuclear force |
| Electroweak Theory | Weak nuclear force |
There is yet to be found a quantum theory of gravity. A good overview over attempts made to unify physical theories is provided by the cGh cube, seen in the diagram below: