Spiral Instabilities in N-body Simulations: Emergence from noise II
arXiv:2001.00855 · doi:10.1093/mnras/staa034
Abstract
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.
arXiv commentAccepted to appear in MNRAS. 4 pages, 2 figures
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