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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク epicyclic frequency ： ウィキペディア英語版 epicyclic frequency In astrophysics, particularly the study of accretion disks, the epicyclic frequency is the frequency at which a radially displaced fluid parcel will oscillate. It can be referred to as a "Rayleigh discriminant". When considering an astrophysical disc with differential rotation $\backslash Omega$, the epicyclic frequency $\backslash kappa$ is given by : $\backslash kappa^\; \backslash equiv\; \backslash frac\backslash frac(R^2\; \backslash Omega)$, where R is the radial co-ordinate.〔p161, Astrophysical Flows, Pringle and King 2007〕 This quantity can be used to examine the 'boundaries' of an accretion disc - when $\backslash kappa^$ becomes negative then small perturbations to the (assumed circular) orbit of a fluid parcel will become unstable, and the disc will develop an 'edge' at that point. For example, around a Schwarzschild black hole, the Innermost Stable Circular Orbit (ISCO) occurs at 3x the event horizon - at $6GM/c^$. For a Keplerian disk, $\backslash kappa\; =\; \backslash Omega$. == References == 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「epicyclic frequency」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.