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Observed Spectra

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The Transition to Chaos

Part of the book series: Institute for Nonlinear Science ((INLS))

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Abstract

In classical systems we have a clear picture of the mechanism by which constants of the motion are destroyed, because constants of the motion constrain phase space trajectories to surfaces of lower dimension (KAM surfaces). When these surfaces are destroyed, trajectories are free to wander in a chaotic manner throughout regions of higher dimension. This whole process is easily seen numerically in Poincare surfaces of section. In quantum systems, we cannot define phase space trajectories because we cannot simultaneously specify both the momentum and position of a particle with arbitrarily high precision due to the uncertainty principle. However, what has proven to be extremely useful is a study of the statistical properties of quantum systems whose classical counterparts undergo a transition from regular (dominated by KAM surfaces) to chaotic behavior. Indeed, Percival [Percival 1973] suggested that this might be so, at least in the semiclassical limit, since when a constant of the motion is destroyed so is the quantum number that one might assign to it.

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© 1992 Springer Science+Business Media New York

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Reichl, L.E. (1992). Observed Spectra. In: The Transition to Chaos. Institute for Nonlinear Science. Springer, New York, NY. https://doi.org/10.1007/978-1-4757-4352-4_7

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  • DOI: https://doi.org/10.1007/978-1-4757-4352-4_7

  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4757-4354-8

  • Online ISBN: 978-1-4757-4352-4

  • eBook Packages: Springer Book Archive

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