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arXiv quant-ph/0304012quant-ph
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用近似Bohmian轨线表示量子初值

Quantum initial value representations using approximate Bohmian trajectories

Eric R. Bittner

摘要:

量子轨道,起源于de Broglie-Bohm(dBB)流体动力学描述的量子力学,被用来构建时间的关联函数在一个初始值表示(IVR)。该公式是完全量子力学的,并且所得到的关联函数的方程在形式上类似于它们的半经典类似物,但不需要计算稳定性或单值矩阵或共枕点。然后,我们通过沿每条路径演化波函数的累积量,得到{ \em local}轨迹描述,得到的运动方程是一个无限的层次,我们在给定的阶上截断。我们表明,时间关联函数计算使用这些近似的量子轨道可以用来准确地计算各种潜在的系统的本征值谱。

英文摘要:

Quantum trajectories, originating from the de Broglie-Bohm (dBB) hydrodynamic description of quantum mechanics, are used to construct time-correlation functions in an initial value representation (IVR). The formulation is fully quantum mechanical and the resulting equations for the correlation functions are similar in form to their semi-classical analogs but do not require the computation of the stability or monodromy matrix or conjugate points. We then move to a {\em local} trajectory description by evolving the cumulants of the wave function along each individual path. The resulting equations of motion are an infinite hierarchy, which we truncate at a given order. We show that time-correlation functions computed using these approximate quantum trajectories can be used to accurately compute the eigenvalue spectrum for various potential systems.

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