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Dirac equation

Adds special relativity to the Schrödinger equation, and the following conclusions come basically as a direct consequence of this!

Experiments explained:

spontaneous emission coefficients.
fine structure, notably for example Dirac equation solution for the hydrogen atom
antimatter
particle creation and annihilation

Experiments not explained: those that quantum electrodynamics explains like:

Lamb shift
TODO: quantization of the electromagnetic field as photons?

See also: Dirac equation vs quantum electrodynamics.

The Dirac equation is a set of 4 partial differential equations on 4 complex valued wave functions. The full explicit form in Planck units is shown e.g. in Video 2. "Quantum Mechanics 12a - Dirac Equation I by ViaScience (2015)" at youtu.be/OCuaBmAzqek?t=1010:

i \partial_{t} ψ_{1} ψ_{2} ψ_{3} ψ_{4} = - i \partial_{x} ψ_{4} ψ_{3} ψ_{2} ψ_{1} + \partial_{y} - ψ_{4} ψ_{3} - ψ_{2} ψ_{1} - i \partial_{z} ψ_{3} - ψ_{4} ψ_{1} - ψ_{2} + m ψ_{1} ψ_{2} - ψ_{3} - ψ_{4}

Expanded Dirac equation in Planck units

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Then as done at physics.stackexchange.com/questions/32422/qm-without-complex-numbers/557600#557600 from why are complex numbers used in the Schrodinger equation?, we could further split those equations up into a system of 8 equations on 8 real-valued functions.

Quantum Mechanics 12a - Dirac Equation I by ViaScience (2015)

PHYS 485 Lecture 14: The Dirac Equation by Roger Moore (2016)

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