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... Given two systems of N1 ≈ N2 = 1022 spins with multiplicity functions g1(N1,s1) and g2(N2,s-s1), the product g1g2 as a function of s1 is relatively sharply peaked at s1 = ŝ1. For s1 = ŝ1 + 1012, the product g1g2 is reduced by 10-174 from its peak value. Use the Gaussian approximation of the multipli ...
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Propagator

In quantum mechanics and quantum field theory, the propagator gives the probability amplitude for a particle to travel from one place to another in a given time, or to travel with a certain energy and momentum. In Feynman diagrams, which calculate the rate of collisions in quantum field theory, virtual particles contribute their propagator to the rate of the scattering event described by the diagram. They also can be viewed as the inverse of the wave operator appropriate to the particle, and are therefore often called Green's functions.
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