On the classical and quantum dynamics of a class of nonpolynomial oscillators

TL;DR

This paper investigates classical and quantum dynamics of specific nonlinear oscillators with position-dependent mass, providing exact and quasi-exact solutions, and extends the analysis to three dimensions.

Contribution

It introduces new solvability results for Higgs and nonpolynomial oscillators with position-dependent mass, including exact solutions and quasi-exact solutions via Bethe ansatz, and extends these to three dimensions.

Findings

Higgs oscillator is exactly solvable under certain conditions.

The nonpolynomial system is quasi-exactly solvable using Bethe ansatz.

Three-dimensional generalizations are solved exactly or quasi-exactly.

Abstract

We consider two one dimensional nonlinear oscillators, namely (i) Higgs oscillator and (ii) a $k$-dependent nonpolynomial rational potential, where $k$ is the constant curvature of a Riemannian manifold. Both the systems are of position dependent mass form, ${\displaystyle m(x) = \frac{1}{(1 + k x^2)^2}}$, belonging to the quadratic Li$\acute{e}$nard type nonlinear oscillators. They admit different kinds of motions at the classical level. While solving the quantum versions of the systems, we consider a generalized position dependent mass Hamiltonian in which the ordering parameters of the mass term are treated as arbitrary. We observe that the quantum version of the Higgs oscillator is exactly solvable under appropriate restrictions of the ordering parameters, while the second nonlinear system is shown to be quasi exactly solvable using the Bethe ansatz method in which the arbitrariness of ordering parameters also plays an important role to obtain quasi-polynomial solutions. We extend the study to three dimensional generalizations of these nonlinear oscillators and obtain the exact solutions for the classical and quantum versions of the three dimensional Higgs oscillator. The three dimensional generalization of the quantum counterpart of the $k$-dependent nonpolynomial potential is found out to be quasi exactly solvable.