论文标题
N体模拟中的螺旋不稳定性：噪声II的出现
Spiral Instabilities in N-body Simulations: Emergence from noise II
论文作者
论文摘要
较早的论文提出了一个潜在的重要发现，即在简化的恒星盘模型模拟中的干扰被预测在线性理论中稳定会在很长一段时间内增长到大幅度。真正不稳定性的最终外观归因于非线性散射，这是由于有限数量的粒子的射击噪声而激发的一系列集体波。该论文得出的结论是，没有有限数量的颗粒可以模仿光滑的圆盘。由于这一令人惊讶的发现被挑战为所采用的数值方案的工件，因此我们在这里使用确认原始行为的不同网格几何形状对同一模型进行了新的计算。
An earlier paper presented the potentially significant discovery that disturbances in simplified simulations of a stellar disc model that was predicted to be stable in linear theory grew to large amplitude over a long period of time. The ultimate appearance of true instabilities was attributed to non-linear scattering by a succession of collective waves excited by shot noise from the finite number of particles. The paper concluded that no finite number of particles, however large, could mimic a smooth disc. As this surprising finding has been challenged as an artifact of the numerical scheme employed, we here present a new calculation of the same model using a different grid geometry that confirms the original behaviour.
