Quantum Theory

In theoretical physics, quantum field theory (QFT) is a theoretical framework for constructing quantum mechanicalmodels of subatomic particles in particle physics and quasiparticles in condensed matter physics. A QFT treats particles as excited states of an underlying physical field, so these are called field quanta.

For example, quantum electrodynamics (QED) has one electron field and one photon field; quantum chromodynamics(QCD) has one field for each type of quark; and, in condensed matter, there is an atomic displacement field that gives rise to phonon particles. Edward Witten describes QFT as "by far" the most difficult theory in modern physics.

 

good save

 

Well quantum theory is as interesting as science can get, but I personally like particle physics more, quarks are cooler than electrons (because they actually make things) and lets not forget that because of photons having zero mass that the electromagnetic field of atoms is thought to be infinite which is amazing.