Problems about Causality in Fermi's Two-Atom Model and Possible Resolutions

Details Problems about Causality in Fermi's Two-Atom Model and Possible Resolutions Problems about Causality in Fermi's Two-Atom Model and Possible Resolutions

1997-07-07

arxiv.org/abs/quant-ph/9707016v1

Physics

Quantum Physics

13 pages, Latex

Scientific paper

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.

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