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arXiv 1107.4972quant-phhep-th
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非厄米非$PT$对称Hamilton系统的一种可能方法

A possible method for non-Hermitian and non-$PT$-symmetric Hamiltonian systems

Jun-Qing Li, Yan-Gang Miao, Zhao Xue

摘要:

通过寻找一个厄米算符$η_+$,并将湮灭算符和产生算符定义为彼此的$η_+$ -伪厄米伴随,提出了一种研究非厄米哈密顿量的可能方法.算符$η_+$表示哈密顿算符的$η_+$ -伪厄米性。作为一个例子,构造了一个非厄米非$PT$对称的含虚线性坐标和线性动量项的哈密顿量,并对其进行了详细的分析.找到了算符$η_+$,在此基础上,得到了非厄米非$PT$对称哈密顿量的实谱和正定内积,以及波函数的概率解释、本征态的正交性和时间演化的么正性.当推广到具有非对易空间坐标算子和非对易动量算子的正则非对易空间时,证明了该哈密顿量是耦合的。我们的方法适用于耦合哈密顿量。然后计算了能级的一阶和二阶非对易修正,特别是能谱的真实性、内积的正定性以及相关性质(波函数的概率解释、本征态的正交性和时间演化的么正性)不因非对易性而改变.

英文摘要:

A possible method to investigate non-Hermitian Hamiltonians is suggested through finding a Hermitian operator $η_+$ and defining the annihilation and creation operators to be $η_+$-pseudo-Hermitian adjoint to each other. The operator $η_+$ represents the $η_+$-pseudo-Hermiticity of Hamiltonians. As an example, a non-Hermitian and non-$PT$-symmetric Hamiltonian with imaginary linear coordinate and linear momentum terms is constructed and analyzed in detail. The operator $η_+$ is found, based on which, a real spectrum and a positive-definite inner product, together with the probability explanation of wave functions, the orthogonality of eigenstates, and the unitarity of time evolution, are obtained for the non-Hermitian and non-$PT$-symmetric Hamiltonian. Moreover, this Hamiltonian turns out to be coupled when it is extended to the canonical noncommutative space with noncommutative spatial coordinate operators and noncommutative momentum operators as well. Our method is applicable to the coupled Hamiltonian. Then the first and second order noncommutative corrections of energy levels are calculated, and in particular the reality of energy spectra, the positive-definiteness of inner products, and the related properties (the probability explanation of wave functions, the orthogonality of eigenstates, and the unitarity of time evolution) are found not to be altered by the noncommutativity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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