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arXiv 2007.01170math.NAcs.NA
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关于多体问题的守恒差分格式

On conservative difference schemes for the many-body problem

Vladimir Gerdt, Mikhail Malykh, Leonid Sevastianov, Yu Ying

摘要:

本文提出了一种构造多体问题的任意阶差分格式的新方法。我们引入了附加变量,即物体之间的距离和相互距离,并写出了一组关于坐标、速度和附加变量的微分方程。在这种情况下,系统失去了它的哈密顿形式,但是所考虑的多体问题的所有经典运动积分,以及描述物体坐标和附加变量之间关系的新积分,都是用这些新变量的线性或二次多项式来描述的。因此,任何辛龙格-库塔格式精确地保持这些积分。所提出的方法的证据。为了说明理论,在一个平面上的三体问题的数值实验的结果与选择的初始数据对应的机构沿8(舞蹈测试)的运动。

英文摘要:

A new approach to the construction of difference schemes of any order for the many-body problem that preserves all its algebraic integrals is proposed. We introduced additional variables, namely, distances and reciprocal distances between bodies, and wrote down a system of differential equations with respect to coordinates, velocities, and the additional variables. In this case, the system lost its Hamiltonian form, but all the classical integrals of motion of the many-body problem under consideration, as well as new integrals describing the relationship between the coordinates of the bodies and the additional variables are described by linear or quadratic polynomials in these new variables. Therefore, any symplectic Runge-Kutta scheme preserves these integrals exactly. The evidence for the proposed approach is given. To illustrate the theory, the results of numerical experiments for the three-body problem on a plane are presented with the choice of initial data corresponding to the motion of the bodies along a figure of eight (choreographic test).

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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