Ciro Santilli
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TODO. Can't find it easily. Anyone?
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This is closely linked to the Pauli exclusion principle.
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What does a particle even mean, right? Especially in quantum field theory, where two electrons are just vibrations of a single electron field.
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As mentioned at lecture 1 https://youtube.com/watch?video=H3AFzbrqH68&t=555, 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.
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Bibliography:
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