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Dynamics of observables in a q-deformed harmonic oscillator

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Abstract

Chaos in classical systems has been studied in plenty over many years. Although the search for chaos in quantum systems has been an area of prominent research over the last few decades, the detailed analysis of many inherently chaotic quantum systems based on expectation values of dynamical variables has not been reported in the literature. In this paper, we extend the study of dynamical behaviour using expectation values of variables to a q-deformed harmonic oscillator. The system is found to be periodic, quasi-periodic or chaotic depending on the values of the deformation parameter q and the deformed coherent amplitude αq, thus enabling us to explicitly classify the chaotic nature of the system on the basis of these parameters. The chaotic properties of the system are clearly illustrated through recurrence plots, power spectra, first-return-time distributions and Lyapunov exponents of the time series obtained for the expectation values of the dynamic variables.

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Authors and Affiliations

  1. Department of Physics, National Institute of Technology Calicut, Kozhikode, 673601, India

    Aditi Pradeep

  2. Department of Physics, Indian Institute of Space Science and Technology, Thiruvananthapuram, 695547, India

    Sasidharan Anupama & Chethil Sudheesh

Authors
  1. Aditi Pradeep
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  2. Sasidharan Anupama
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  3. Chethil Sudheesh
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Correspondence to Chethil Sudheesh.

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Pradeep, A., Anupama, S. & Sudheesh, C. Dynamics of observables in a q-deformed harmonic oscillator. Eur. Phys. J. D 74, 3 (2020). https://doi.org/10.1140/epjd/e2019-100436-y

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  • DOI: https://doi.org/10.1140/epjd/e2019-100436-y

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