= Solutions of the Schrodinger equation for two electrons
TODO. Can't find it easily. Anyone?
This is closely linked to the <Pauli exclusion principle>.
What does a particle even mean, right? Especially in <quantum field theory>, where two electrons are just vibrations of a single electron field.
Another issue is that if we consider <magnetism>, things only make sense if we add <special relativity>, since <Maxwell's equations require special relativity>, so a non approximate solution for this will necessarily require full <quantum electrodynamics>.
As mentioned at <david tong s 2009 quantum field theory lectures at the perimeter institute/lecture 1> https://youtube.com/watch?video=H3AFzbrqH68&t=555[], <special relativity>[relativistic] quantum mechanical theories like the <Dirac equation> and <Klein-Gordon equation> make no sense for a "single particle": they must imply that particles can pop in out of existence.
Bibliography:
* https://www.youtube.com/watch?v=Og13-bSF9kA&list=PLDfPUNusx1Eo60qx3Od2KLUL4b7VDPo9F "Advanced quantum theory" by <Tobias J. Osborne> says that the course will essentially cover multi-particle quantum mechanics!
* https://physics.stackexchange.com/questions/54854/equivalence-between-qft-and-many-particle-qm "Equivalence between QFT and many-particle QM"
* Course: Quantum Many-Body Physics in Condensed Matter by Luis Gregorio Dias (2020) from <course: Quantum Many-Body Physics in Condensed Matter by Luis Gregorio Dias (2020)> give a good introduction to non-interacting particles
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