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arXiv:1609.04485 · Foundations of Physics

Perturbations and Quantum Relaxation

Adithya Kandhadai, Antony Valentini

Published Dec 1, 2018• 8 citations
arXivHTMLPDF
DOI
10.1007/s10701-018-0227-3

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We investigate the occurrence of exponential relaxation in a certain class of closed, finite systems on the basis of a time-convolutionless projection operator expansion for a specific class of initial states with vanishing inhomogeneity. It turns out that exponential behavior is to be expected only if the leading order predicts the standard separation of time scales and if, furthermore, all higher orders remain negligible for the full relaxation time. The latter, however, is shown to depend not only on the perturbation (interaction) strength, but also crucially on the structure of the perturbation matrix. It is shown that perturbations yielding exponential relaxation have to fulfill certain criteria, one of which relates to the so-called "Van Hove structure." All our results are verified by the numerical integration of the full time-dependent Schrödinger equation.