A fast simple algorithm for computing the potential of charges on a line

A fast simple algorithm for computing the potential of charges on a line
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一种计算线上电荷势的快速简单算法

DOI:
10.1016/j.acha.2020.06.002
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发表时间:
2020
影响因子:
2.5
通讯作者:
Rokhlin, Vladimir
Rokhlin, Vladimir
中科院分区:
数学1区
文献类型:
--
作者:
Gimbutas, Zydrunas;Marshall, Nicholas F.;Rokhlin, Vladimir

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我们提出了一种快速求表达式u j=∑i= 1, i≠j n α i x i - x j的方法,对于j= 1,…,n,其中α i是实数,而x i是紧致区间R中的点。这个表达式可以看作是表示r3中直线上电荷产生的静电势。虽然存在计算r3中一般电荷分布的静电势的快速算法,但在计算物理的许多情况下,有一种简单而极快的方法来计算直线上的电荷势是有用的;本文给出了这种方法,并给出了几个算例的数值结果。
We present a fast method for evaluating expressions of the form u j=∑ i= 1, i≠ j n α i x i− x j, for j= 1,…, n, where α i are real numbers, and x i are points in a compact interval of R. This expression can be viewed as representing the electrostatic potential generated by charges on a line in R 3. While fast algorithms for computing the electrostatic potential of general distributions of charges in R 3 exist, in a number of situations in computational physics it is useful to have a simple and extremely fast method for evaluating the potential of charges on a line; we present such a method in this paper, and report numerical results for several examples.
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