What are the branches of modern physics

The main branches of classical physics include: Classical Mechanics Electromagnetism Classical Optics Thermodynamics Fluid mechanics In modern physics, there are a lot of different fields of study including: The Special Theory of Relativity The General Theory of Relativity Quantum Mechanics. Nuclear Particle Physics Solid state physics, incuding semiconductors. Statistical thermodynamics Quantum Electrodynamics (QED) Quantum Chromodynamics (QCD) In Modern Physics, optics and electricity & magnetism have been unified, especially through the use of Special Relativity. [Three of the most important fields of Modern Physics had been left out. I have put them first , second, and third on the list. By definition, these are Modern Physics because they are products of the 20th century. Also, some very important parts of Classical Physics had been left out, such as fluid mechanics.]