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arXiv 1003.4788nucl-thcond-mat.quant-gascond-mat.str-el
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二体矩阵元的可分逼近

Separable approximation to two-body matrix elements

L. M. Robledo

摘要:

任意局部相互作用的两体矩阵元素被写成可分离项的总和,这种方式非常适合于平均场计算中存在的交换和配对通道。展开依赖于到质心和相对坐标的变换(在Talmi方法的精神中),因此它仅对谐振子单粒子态有用(有限数量的展开项)。研究了高斯两体相互作用下展开式随保留项数的收敛性。还考虑了接触力(δ)的极限。并对一般情况下的处理方法进行了讨论。

英文摘要:

Two-body matrix elements of arbitrary local interactions are written as the sum of separable terms in a way that is well suited for the exchange and pairing channels present in mean-field calculations. The expansion relies on the transformation to center of mass and relative coordinate (in the spirit of Talmi's method) and therefore it is only useful (finite number of expansion terms) for harmonic oscillator single particle states. The converge of the expansion with the number of terms retained is studied for a Gaussian two body interaction. The limit of a contact (delta) force is also considered. Ways to handle the general case are also discussed.

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