Travelling-wave and separated variable solutions of a nonlinear Schroedinger equation

Tassos Bountis, Fernando D. Nobre

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Some interesting nonlinear generalizations have been proposed recently for the linear Schroedinger, Klein-Gordon, and Dirac equations of quantum and relativistic physics. These novel equations involve a real parameter q and reduce to the corresponding standard linear equations in the limit q → 1. Their main virtue is that they possess plane-wave solutions expressed in terms of a q-exponential function that can vanish at infinity, while preserving the Einstein energy-momentum relation for all q. In this paper, we first present new travelling wave and separated variable solutions for the main field variable Ψ(x, t), of the nonlinear Schroedinger equation (NLSE), within the q-exponential framework, and examine their behavior at infinity for different values of q.We also solve the associated equation for the second field variable Φ(x, t), derived recently within the context of a classical field theory, which corresponds to Ψ*(x, t) for the linear Schroedinger equation in the limit q → 1. For x → R, we show that certain perturbations of these q-exponential solutions Ψ(x, t) and Φ(x, t) are unbounded and hence would lead to divergent probability densities over the full domain -∞ < x < 8. However, we also identify ranges of q values for which these solutions vanish at infinity, and may therefore be physically important.

Original languageEnglish
Article number082106
JournalJournal of Mathematical Physics
Issue number8
Publication statusPublished - Aug 1 2016
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Mathematical Physics

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