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Physical principles in quantum field theory and in covariant harmonic oscillator formalism

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It is shown that both covariant harmonic oscillator formalism and quantum field theory are based on common physical principles which include Poincaré covariance, Heisenberg's space-momentum uncertainty relation, and Dirac's “C-number” time-energy uncertainty relation. It is shown in particular that the oscillator wave functions are derivable from the physical principles which are used in the derivation of the Klein-Nishina formula.

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Han, D., Kim, Y.S. & Noz, M.E. Physical principles in quantum field theory and in covariant harmonic oscillator formalism. Found Phys 11, 895–905 (1981).

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