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Bound-state soliton gas as a limit of adiabatically growing integrable turbulence

Author

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  • Agafontsev, Dmitry S.
  • Gelash, Andrey A.
  • Mullyadzhanov, Rustam I.
  • Zakharov, Vladimir E.

Abstract

We study numerically the integrable turbulence in the framework of the one-dimensional nonlinear Schrodinger equation (1D-NLSE) of the focusing type using a new approach called the “growing of turbulence”. In this approach, we add a small linear pumping term to the equation and start evolution from statistically homogeneous Gaussian noise. After reaching a certain level of average intensity, we switch off the pumping and examine the resulting integrable turbulence. For sufficiently small initial noise and pumping coefficient, and also for not very wide simulation box (basin length), we observe that the turbulence grows in a universal adiabatic regime, moving successively through the statistically stationary states of the integrable 1D-NLSE, which do not depend on the pumping coefficient, amplitude of the initial noise or basing length. Waiting longer in the growth stage, we transit from weakly nonlinear states to strongly nonlinear ones, characterized by a high frequency of rogue waves. Using the inverse scattering transform (IST) method to monitor the evolution, we observe that the solitonic part of the wavefield becomes dominant even when the (linear) dispersion effects are still leading in the dynamics and with increasing average intensity the wavefield approaches a dense bound-state soliton gas, whose properties are defined by the Fourier spectrum of the initial noise. Regimes deviating from the universal adiabatic growth also lead to solitonic states, but solitons in these states have noticeably different velocities and a significantly wider distribution by amplitude, while the statistics of wavefield indicates a much more frequent appearance of very large waves.

Suggested Citation

  • Agafontsev, Dmitry S. & Gelash, Andrey A. & Mullyadzhanov, Rustam I. & Zakharov, Vladimir E., 2023. "Bound-state soliton gas as a limit of adiabatically growing integrable turbulence," Chaos, Solitons & Fractals, Elsevier, vol. 166(C).
  • Handle: RePEc:eee:chsofr:v:166:y:2023:i:c:s0960077922011304
    DOI: 10.1016/j.chaos.2022.112951
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    References listed on IDEAS

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    1. Pierre Suret & Rebecca El Koussaifi & Alexey Tikan & Clément Evain & Stéphane Randoux & Christophe Szwaj & Serge Bielawski, 2016. "Single-shot observation of optical rogue waves in integrable turbulence using time microscopy," Nature Communications, Nature, vol. 7(1), pages 1-8, December.
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