Asymptotic Momentum Conservation
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That momentum should satisfy a conservation law is, after relativistic invariance, the most important property of a physical theory in special relativity. (Four-momentum is meant here, as will always be understood when the word is not qualified.) In many theories of importance today the physical system is decomposed into simpler subsystems of particles and fields. Momentum is attributed to each subsystem, and if the subsystems interact momentum can be transferred between them, but overall it must be conserved.
KeywordsRest Frame Momentum Conservation Inertial Frame Momentum Vector Scattered Photon
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