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arXiv quant-ph/0511229quant-ph
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波场的量子经典动力学

Quantum-Classical Dynamics of Wave Fields

Alessandro Sergi

摘要:

本文将最近提出的相空间相关算符的量子经典力学的一种方法,改造为波场的一种形式。这样的波场服从一个耦合的非线性方程组,该方程组可以通过适当的非哈密顿括号来表示。作为一个例子,该理论被应用到自旋玻色子模型的弛豫动力学。在绝热极限,一个很好的协议与计算进行的运营商的方法。此外,本文提出的理论可以考虑非绝热效应,而不诉诸表面跳跃近似。因此,所获得的结果定性地遵循以前的表面跳跃计算和增加(至少)两个因素的时间长度,在此期间非绝热动力学可以传播小的统计误差。此外,值得注意的是,这里提出的量子经典波场的动力学是Weinberg最近引入的非线性量子力学形式的直接非Hamilton推广。

英文摘要:

An approach to the quantum-classical mechanics of phase space dependent operators, which has been proposed recently, is remodeled as a formalism for wave fields. Such wave fields obey a system of coupled non-linear equations that can be written by means of a suitable non-Hamiltonian bracket. As an example, the theory is applied to the relaxation dynamics of the spin-boson model. In the adiabatic limit, a good agreement with calculations performed by the operator approach is obtained. Moreover, the theory proposed in this paper can take nonadiabatic effects into account without resorting to surface-hopping approximations. Hence, the results obtained follow qualitatively those of previous surface-hopping calculations and increase by a factor of (at least) two the time length over which nonadiabatic dynamics can be propagated with small statistical errors. Moreover, it is worth to note that the dynamics of quantum-classical wave fields here proposed is a straightforward non-Hamiltonian generalization of the formalism for non-linear quantum mechanics that Weinberg introduced recently.

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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