Quantum theory

Quantum theory may mean:

Quantum mechanics, a branch of physics explaining the physical behaviours at the molecular, atomic and sub-atomic levels
Quantum field theory, a general type of quantum theory, which includes:
 Quantum electrodynamics
 Quantum chromodynamics
 Electroweak interaction
 Quantum gravity, a general term for theories intended to quantize general relativity

 Related pages 
Planck constant
Stefan–Boltzmann law