Testing wave turbulence theory for Gross-Pitaevskii system

TL;DR

This study validates the weak wave turbulence theory by comparing numerical solutions of the Gross-Pitaevskii equation with the wave-kinetic equation, showing strong agreement for initial times and insights into wave statistics evolution.

Contribution

It provides the first detailed numerical validation of the wave turbulence theory for the GPE, confirming the WKE's predictive accuracy without adjustable parameters.

Findings

WKE accurately predicts GPE evolution for about two nonlinear times

Qualitative agreement persists longer with some deviations

Wave statistics tend toward Gaussianity within the kinetic time scale

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 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 time scale of the order of the kinetic time.The excellent agreement between direct numerical simulations of the GPE and the WKE provides a new and solid ground to the theory of weak wave turbulence.