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arXiv:2511.12980 · Physics Letters A

An amended Ehrenfest theorem for the Gross-Pitaevskii equation in one- and two-dimensional potential boxes

Hidetsugu Sakaguchi, Boris A. Malomed

Published Nov 20, 2025• 0 citations
arXivHTMLPDF
DOI
10.1016/j.physleta.2025.131161

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We have derived some excitation states of the one-dimensional Gross-Pitaevskii equation coupled by the gravitational potential. The methods that we have used here are taken by pursuing the recent work of Kivshar et. al. by considering the equation as a macroscopic quantum oscillator. To obtain the states, we have made the appropriate transformation to reduce the three-dimensional Gross-Pitaevskii equation into the one-dimensional Gross-Pitaevskii equation and applying the time-independent perturbation theory in the general solution of the one-dimensional Gross-Pitaevskii equation as a linear superposition of the normalized eigenfunctions of the Schrödinger equation for the harmonic oscillator potential. Moreover, we also impose the condition by assuming that some terms in the equation should be so small in order to preserve the use of the perturbation method.