Spiral instabilities in N-body simulations – II. Emergence from noise
AuthorSellwood, J A
AffiliationUniv Arizona, Steward Observ
MetadataShow full item record
PublisherOXFORD UNIV PRESS
CitationJ A Sellwood, Spiral instabilities in N-body simulations – II. Emergence from noise, Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 3, March 2020, Pages 3103–3106, https://doi.org/10.1093/mnras/staa034
RightsCopyright © 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society
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AbstractAn 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 artefact 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.
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