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Problems about Causality in Fermi's Two-Atom Model and Possible Resolutions by Hegerfeldt, Gerhard C. is a scholarly article available to read on EtoBox.

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In order to check finite propagation speed Fermi, in 1932, had considered two atoms A and B separated by some distance R. At time t=0, A is in an excited state, B in its ground state, and no photons are present. Fermi's idea was to calculate the excitation probability of B. In a model-independent way and with minimal assumptions - Hilbert space and positive energy only - it is proved, not just for atoms but for any systems A and B, that the excitation probability of B is nonzero immediately after t=0. Possible ways out to avoid a contradiction to finite propagation speed are discussed. The notions of strong and weak Einstein causality are introduced.

Author

Hegerfeldt, Gerhard C.

Published

1997

Language

EN