Exact Soliton Solution for Superfluid Film Dynamics

Susumu Kurihara*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


Traveling wave solutions are examined for the nonlinear wave equation i∂ψ/ ∂t=-∂2ψ/∂x2 + [-(1+d/1+d|ψ|2)2]ψ, which describes the dynamics of condensate wave function ψ(x, t) in superfluid film of mean thickness d. An exact one-soliton solution is obtained analytically for arbitrary amplitude, and this suggests that the "quasi-solitons" found in the previous numerical work are stable at least in the asymptotic situation where quasi-solitons are essentially non-overlapping. It is shown explicitly that our solution reduces, in small amplitude regime, to the Korteweg-de Vries one-soliton solution.

Original languageEnglish
Pages (from-to)3801-3805
Number of pages5
JournalJournal of the Physical Society of Japan
Issue number11
Publication statusPublished - 1981 Nov
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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