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arXiv 2008.07134quant-phnlin.SI
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一类非多项式振子的经典和量子动力学

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

V. Chithiika Ruby, M. Lakshmanan

摘要:

考虑两个一维非线性振子,即(i)Higgs振子和(ii)依赖于$k$的非多项式有理势,其中$k$是黎曼流形的常曲率.这两个系统都具有依赖于位置的质量形式${\displaystyle m(x) = \frac{1}{(1 + k x^2)^2}}$,属于二次Li $\acute{e}$ nard型非线性振子.它们在经典水平上承认不同种类的运动。在求解量子形式的系统时,我们考虑了广义位置相关的质量哈密顿量,其中质量项的序参量被视为任意的。我们观察到,量子版的希格斯振子是精确可解的序参数的适当限制下,而第二个非线性系统被证明是准精确可解的使用Bethe anomaly方法,其中的序参数的任意性也起着重要的作用,以获得准多项式的解决方案。我们将研究扩展到这些非线性振子的三维推广,并得到了三维Higgs振子的经典和量子形式的精确解。证明了与$k$相关的非多项式势的量子对应体的三维推广是准精确可解的。

英文摘要:

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.

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