Deviations from exponential law and Van Hove's "λ^2 t" limit

Details Deviations from exponential law and Van Hove's "λ^2 t" limit Deviations from exponential law and Van Hove's "λ^2 t" limit

1999-04-06

arxiv.org/abs/quant-ph/9904020v1

Physica A271 (1999) 133-146

Physics

Quantum Physics

18 pages, 3 figures

Scientific paper

10.1016/S0378-4371(99)00209-5

The deviations from a purely exponential behavior in a decay process are analyzed in relation to Van Hove's "\lambda^2 t" limiting procedure. Our attention is focused on the effects that arise when the coupling constant is small but nonvanishing. We first consider a simple model (two-level atom in interaction with the electromagnetic field), then gradually extend our analysis to a more general framework. We estimate all deviations from exponential behavior at leading orders in the coupling constant.

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