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arXiv quant-ph/0411137quant-phhep-thmath-phmath.MP
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PT对称三次非谐振子的物理模型

PT-Symmetric Cubic Anharmonic Oscillator as a Physical Model

Ali Mostafazadeh

摘要:

我们对PT对称三次非谐振子$ H=p^1/(2m)+μ^2x^2/2+iεx^3 $的物理观测量,特别是赝厄米位置和动量算符、等效厄米哈密顿算符和经典哈密顿算符进行了微扰计算.忽略条款的顺序$ ε^4 $和更高的,我们表明,该系统描述了一个普通的四次非谐振子的位置依赖的质量和真正的和积极的耦合常数。这一观察阐明了能谱的实在性和正性的经典起源。我们还讨论了这个PT-对称系统的量子经典对应,计算相关的保守概率密度,并评论的问题的因子排序的伪厄米正则量子化的基础经典系统。

英文摘要:

We perform a perturbative calculation of the physical observables, in particular pseudo-Hermitian position and momentum operators, the equivalent Hermitian Hamiltonian operator, and the classical Hamiltonian for the PT-symmetric cubic anharmonic oscillator, $ H=p^1/(2m)+μ^2x^2/2+iεx^3 $. Ignoring terms of order $ ε^4 $ and higher, we show that this system describes an ordinary quartic anharmonic oscillator with a position-dependent mass and real and positive coupling constants. This observation elucidates the classical origin of the reality and positivity of the energy spectrum. We also discuss the quantum-classical correspondence for this PT-symmetric system, compute the associated conserved probability density, and comment on the issue of factor-ordering in the pseudo-Hermitian canonical quantization of the underlying classical system.

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