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Ordered and chaotic Bohmian trajectories

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Abstract

We discuss the issue of ordered and chaotic trajectories in the Bohmian approach of Quantum Mechanics from points of view relevant to the methods of Celestial Mechanics. The Bohmian approach gives the same results as the orthodox (Copenhagen) approach, but it considers also underlying trajectories guided by the wave. The Bohmian trajectories are rather different from the corresponding classical trajectories. We give examples of a classical chaotic system that is ordered quantum-mechanically and of a classically ordered system that is mostly chaotic quantum mechanically. Then we consider quantum periodic orbits and ordered orbits, that can be represented by formal series of the “third integral” type, and we study their asymptotic properties leading to estimates of exponential stability. Such orbits do not approach the “nodal points” where the wavefunction ψ vanishes. On the other hand, when an orbit comes close to a nodal point, chaos is generated in the neighborhood of a hyperbolic point (called X-point). The generation of chaos is maximum when the X-point is close to the nodal point. Finally we remark that high order periodic orbits may behave as “effectively ordered” or “effectively chaotic” for long times before reaching the period.

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Authors and Affiliations

  1. Research Center for Astronomy, Academy of Athens, Soranou Efessiou 4, 115 27, Athens, Greece

    George Contopoulos & Christos Efthymiopoulos

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  1. George Contopoulos
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  2. Christos Efthymiopoulos
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Correspondence to George Contopoulos.

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Contopoulos, G., Efthymiopoulos, C. Ordered and chaotic Bohmian trajectories. Celest Mech Dyn Astr 102, 219–239 (2008). https://doi.org/10.1007/s10569-008-9127-8

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