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arXiv physics/9611006math-phhep-thmath.MPquant-ph
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非线性振子本征值的一般结构

The General Structure of Eigenvalues of Non-linear Oscillators

Achilles D. Speliotopoulos

摘要:

研究了一维有界非线性振动子的Hilbert空间。结果表明,所有这类振子的本征值结构具有相同的一般形式。它们仅依赖于系统的基态能量和哈密顿量$H$的单个泛函$λ(H)$,该哈密顿量的形式明确地依赖于$H$。还发现非线性振子的希尔伯特空间与简谐振子的希尔伯特空间酉不等价,从而为Haag定理提供了一个明确的例子。构造了非线性振子的一个数算符,确定了与热浴接触的非线性振子的配分函数和平均能量的一般形式。与WKB半经典极限的结果相联系。然后将这种分析应用到$x^4$非谐振子的具体情况。

英文摘要:

Hilbert Spaces of bounded one dimensional non-linear oscillators are studied. It is shown that the eigenvalue structure of all such oscillators have the same general form. They are dependent only on the ground state energy of the system and a single functional $λ(H)$ of the Hamiltonian $H$ whose form depends explicitly on $H$. It is also found that the Hilbert Space of the non-linear oscillator is unitarily inequivalent to the Hilbert Space of the simple harmonic oscillator, providing an explicit example of Haag's Theorem. A number operator for the nonlinear oscillator is constructed and the general form of the partition function and average energy of an non-linear oscillator in contact with a heat bath is determined. Connection with the WKB result in the semi-classical limit is made. This analysis is then applied to the specific case of the $x^4$ anharmonic oscillator.

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