The method collect Entries is used to
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Fields show up when you start doing second quantization.
Ie, you allow the Hilbert space, to include states with all possible values of particle numbers (including infinity), and then try to model how particle changing interactions work. QFT helps organize this picture.
So even, if you don’t start with fields, the attempt to describe the above will drive you toward a field formalism.
Ie, you allow the Hilbert space, to include states with all possible values of particle numbers (including infinity), and then try to model how particle changing interactions work. QFT helps organize this picture.
So even, if you don’t start with fields, the attempt to describe the above will drive you toward a field formalism.
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