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Published September 15, 1954 | Published
Journal Article Open

Use of Causality Conditions in Quantum Theory

Abstract

The limitations on scattering amplitudes imposed by causality requirements are deduced from the demand that the commutator of field operators vanish if the operators are taken at points with space-like separations. The problems of the scattering of spin-zero particles by a force center and the scattering of photons by a quantized matter field are discussed. The causality requirements lead in a natural way to the well-known dispersion relation of Kramers and Kronig. A new sum rule for the nuclear photoeffect is derived and the scattering of photons by nucleons is discussed.

Additional Information

© 1954 American Physical Society. Received 24 May 1954. Published 15 September 1954. It is a pleasure to acknowledge several stimulating conversations with Professor E.P. Wigner. We are also indebted to Professor A. Wightman and to members of the Institute for Advanced Study for helpful conversations. One of us (W.T.) is grateful to the Institute for Advanced Study for a grant-in-aid and to Professor Robert Oppenheimer for the hospitality extended him at the Institute.

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Published - PhysRev.95.1612.pdf

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Created:
August 19, 2023
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October 24, 2023