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Calculating multidimensional discrete variable representations from cubature formulas

机译:根据培养皿公式计算多维离散变量表示

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Finding multidimensional nondirect product discrete variable representations (DVRs) of Hamiltonian operators is one of the long standing challenges in computational quantum mechanics. The concept of a "DVR set" was introduced as a general framework for treating this problem by R. G. Littlejohn, M. Cargo, T. Carrington, Jr., K. A. Mitchell, and B. Poirier (J. Chem. Phys. 2002, 116, 8691). We present a general solution of the problem of calculating multidimensional DVR sets whose points are those of a known cubature formula. As an illustration, we calculate several new nondirect product cubature DVRs on the plane and on the sphere with up to I 10 points. We also discuss simple and potentially very useful finite basis representations (FBRs), based on general (nonproduct) cubatures. Connections are drawn to a novel view on cubature presented by L Degani, J. Schiff, and D. J. Tannor (Num. Math. 2005, 101, 479), in which commuting extensions of coordinate matrices play a central role. Our construction of DVR sets answers a problem left unresolved in the latter paper, namely, the problem of interpreting as function spaces the vector spaces on which commuting extensions act.
机译:寻找哈密顿算子的多维非直接乘积离散变量表示(DVR)是计算量子力学中长期存在的挑战之一。 RG Littlejohn,M. Cargo,T. Carrington,Jr.,KA Mitchell和B. Poirier(J. Chem。Phys。2002,116)引入了“ DVR装置”的概念作为解决此问题的通用框架。 ,8691)。我们提出了一个计算多维DVR集的问题的一般解决方案,这些DVR集的点是已知的培养公式。作为说明,我们在飞机上和球面上计算了几个新的非直接产品孵化器DVR,最多可得10分。我们还将讨论基于普通(非产品)孵化器的简单且可能非常有用的有限基表示(FBR)。关系被L Degani,J。Schiff和D. J. Tannor(Num。Math。2005,101,479)提出的关于居室的新颖观点所吸引,在其中坐标矩阵的通勤扩展起着中心作用。我们的DVR集的构建解决了后一论文中未解决的问题,即将通勤扩展作用于其上的向量空间解释为函数空间的问题。

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