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arXiv 1510.08051quant-phnlin.CD
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广义高斯波包动力学:可积与混沌系统

Generalized Gaussian wave packet dynamics: Integrable and Chaotic Systems

Harinder Pal, Manan Vyas, Steven Tomsovic

摘要:

最终的半经典波包传播技术是一个复杂的,依赖于时间的WBK方法,称为广义高斯波包动力学(GGWPD)。它需要克服许多技术困难,以便在实践中充分实施。在大约二十年前,线性化波包动力学被推广到包括经典可积和混沌动力学系统的偏离中心的真实轨迹集的方法,这些方法完全捕获了动力学输运。这些方法和GGWPD之间的联系是以一种能够更实际地实现GGWPD的方式开发的。一般复杂的鞍点轨迹在其基础上发现使用多维,牛顿-拉夫森根搜索方法,开始与一组偏离中心,真正的轨迹。这是可能的,因为存在一一对应。与每个偏离中心的真实轨迹相关联的相邻轨迹形成穿过唯一鞍的路径;存在可以直接识别的例外。该方法被应用到踢转子,以证明精度的改善作为$\hbar$的功能,使用鞍点轨迹。

英文摘要:

The ultimate semiclassical wave packet propagation technique is a complex, time-dependent WBK method known as generalized Gaussian wave packet dynamics (GGWPD). It requires overcoming many technical difficulties in order to be carried out fully in practice. In its place roughly twenty years ago, linearized wave packet dynamics was generalized to methods that include sets of off-center, real trajectories for both classically integrable and chaotic dynamical systems that completely capture the dynamical transport. The connections between those methods and GGWPD are developed in a way that enables a far more practical implementation of GGWPD. The generally complex saddle point trajectories at its foundation are found using a multi-dimensional, Newton-Raphson root search method that begins with the set of off-center, real trajectories. This is possible because there is a one-to-one correspondence. The neighboring trajectories associated with each off-center, real trajectory form a path that crosses a unique saddle; there are exceptions which are straightforward to identify. The method is applied to the kicked rotor to demonstrate the accuracy improvement as a function of $\hbar$ that comes with using the saddle point trajectories.

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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