Tuesday, December 17, 2019

quantum field theory - How is scattering possible?


Bjorken and Drell's book shows that the 'in' and 'out' states are eigenstates of the full interacting theory. If this is true, then how is scattering possible if both in and out states are eigenstates of the full Hamiltonian of the interacting theory? Do I misunderstand something?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

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