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The Single Quantum Field Theory
There are states of a quantum field theory that to you and me look exactly like one particle. The single quantum field describes simultaneously the possibility of zero particles, one particle, two particles, all the way up. And then there's another set of states that have more energy that have at least twice as much energy as those first set of states. When two of these fields interact, does the wave function branch into interacted and not interacted? Almost.