Exotic Phase Space Dynamics Generated by Orthogonal Polynomial Self-interactions
Abstract
The phase space dynamics generated by different orthogonal polynomial self-interactions exhibited in higher order nonlinear Schr\"{o}dinger equation (NLSE) are often less intuitive than those ofcubic and quintic nonlinearities. Even for nonlinearities as simple as a cubic in NLSE, the dynamics for generic initial states shows surprising features. In this Letter, for the first time, we identify the higher-order nonlinearities in terms of orthogonal polynomials in the generalized NLSE/GPE. More pertinently, we explicate different exotic phase space structures for three specific examples: (i) Hermite, (ii) Chebyshev, and (iii) Laguerre polynomial self-interactions. For the first two self-interactions, we exhibit that the alternating signs of the various higher-order nonlinearities are naturally embedded in these orthogonal polynomials that confirm to the experimental conditions. To simulate the phase-space dynamics that bring about by the Laguerre self-interactions, a source term should {\it necessarily} be included in the modified NLSE/GPE. Recent experiments suggest that this modified GPE captures the dynamics of self-bound quantum droplets, in the presence of external source.
Cite
@article{arxiv.2308.06524,
title = {Exotic Phase Space Dynamics Generated by Orthogonal Polynomial Self-interactions},
author = {Thokala Soloman Raju and T Shreecharan},
journal= {arXiv preprint arXiv:2308.06524},
year = {2023}
}