Abstract: We test the predictions of the theory of weak wave turbulence by performing numerical simulations of the Gross-Pitaevskii equation (GPE) and the associated wave-kinetic equation (WKE). We consider an initial state localized in Fourier space, and we confront the solutions of the WKE obtained numerically with GPE data for both the wave-action spectrum and the probability density functions (PDFs) of the Fourier mode intensities. We find that the temporal evolution of the GPE data is accurately predicted by the WKE, with no adjustable parameters, for about two nonlinear kinetic times. Qualitative agreement between the GPE and the WKE persists also for longer times with some quantitative deviations that may be attributed to the combination of a breakdown of the theoretical assumptions underlying the WKE as well as numerical issues. Furthermore, we study how the wave statistics evolves toward Gaussianity in a timescale of the order of the kinetic time. The excellent agreement between direct numerical simulations of the GPE and the WKE provides a solid foundation to the theory of weak wave turbulence.

Cite: Zhu Y. , Semisalov B. , Krstulovic G. , Nazarenko S.
Testing wave turbulence theory for the Gross-Pitaevskii system
Physical Review E. 2022. V.106. N1. 014205 . DOI: 10.1103/PhysRevE.106.014205 WOS Scopus РИНЦ OpenAlex

Dates:

Submitted:	Dec 14, 2021
Accepted:	May 4, 2022
Published online:	Jul 8, 2022

Identifiers:

Web of science:	WOS:000829952500006
Scopus:	2-s2.0-85134893925
Elibrary:	55737590
OpenAlex:	W3216945718

Citing:

DB	Citing
Scopus	18
Web of science	18
OpenAlex	22

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