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arXiv quant-ph/0511076quant-ph
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量子力学中的非哈密顿交换子

Non-Hamiltonian Commutators in Quantum Mechanics

Alessandro Sergi

摘要:

首先揭示了量子算符的辛结构,然后利用它在量子力学中引入了广义非哈密顿括号。很容易认识到,量子经典系统是由这样一个括号的特定实现来描述的。根据以前的工作,这介绍了一个统一的方法来经典和量子经典非哈密顿动力学。为了说明使用非哈密顿算符,它显示了如何定义量子经典系统中的热力学约束。特别是,量子经典的Nosé-Hoover运动方程和相关的静态密度矩阵的推导。同时给出了Nosé-Hoover链和Nosé-Andersen(恒压恒温)动力学的非哈密顿算符。形式主义的观点进行了讨论。

英文摘要:

The symplectic structure of quantum commutators is first unveiled and then exploited to introduce generalized non-Hamiltonian brackets in quantum mechanics. It is easily recognized that quantum-classical systems are described by a particular realization of such a bracket. In light of previous work, this introduces a unified approach to classical and quantum-classical non-Hamiltonian dynamics. In order to illustrate the use of non-Hamiltonian commutators, it is shown how to define thermodynamic constraints in quantum-classical systems. In particular, quantum-classical Nosé-Hoover equations of motion and the associated stationary density matrix are derived. The non-Hamiltonian commutators for both Nosé-Hoover chains and Nosé-Andersen (constant-pressure constant temperature) dynamics are also given. Perspectives of the formalism are discussed.

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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