Discrete oscillation modes and damped stationary density waves in one-dimensional collisionless systems
Discrete oscillation modes and damped stationary density waves in one-dimensional collisionless systems
复制标题
一维无碰撞系统中的离散振荡模式和阻尼稳态密度波
DOI：
10.1093/mnras/258.3.552
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发表时间：
1992
影响因子：
4.8
通讯作者：
P. D. Louis
中科院分区：
文献类型：
--
作者：
P. D. Louis
研究了一维无碰撞自引力系统平衡位形的小扰动。一个近似的方法的基础上截断的一组力矩方程描述以下的时间演化的扰动。在真实的空间和相空间中的两种特殊情况下，该流体模型能正确地描述无碰撞系统的动力学行为。在一般情况下，预测的频率和低阶振荡模式的形式与N体模拟的结果非常吻合
Small perturbations of equilibrium configurations of one-dimensional collisionless self-gravitating systems are considered. An approximate method based on a truncated set of moment equations is described for following the time evolution of the perturbations. In two special cases, namely constant density in real space and constant density in phase space, this fluid model describes the dynamics of the collisionless system correctly. In general, the predicted frequencies and the form of low-order oscillation modes agree remarkably well with the results of N-body simulations