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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 Propagation of light in non-inertial reference frames ： ウィキペディア英語版 Propagation of light in non-inertial reference frames The description of motion in relativity requires more than one concept of speed. Coordinate speed is the coordinate distance measured by the observer divided by the coordinate time of the observer. Proper speed is the local proper distance divided by the local proper time. For example, at the event horizon of a black hole the coordinate speed of light is zero, while the proper speed is c.〔( Relativity and the Nature of Spacetime ), Vesselin Petkov, Springer, 2009, ISBN 978-3-642-01952-4, Chapter: 7〕 The coordinate speed of light (both instantaneous and average) is slowed in the presence of gravitational fields. The local instantaneous proper speed of light is always c. In an inertial frame an observer cannot detect their motion via light signals as the speed of light in a vacuum is constant. This means an observer can detect when their motion is accelerated by studying light signals. ==See also== *Shapiro time delay *Frame-dragging *Lense–Thirring precession *Sagnac effect *Gravitational time dilation *Gravitational redshift 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「Propagation of light in non-inertial reference frames」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.