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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 Four-frequency ： ウィキペディア英語版 Four-frequency The four-frequency of a massless particle, such as a photon, is a 4-vector defined by :$N^a\; =\; \backslash left(\; \backslash nu,\; \backslash nu\; \backslash hat\}$ is a unit vector in the direction of the photon's motion. The four-frequency of a photon is always a future-pointing and null vector. An observer moving with four-velocity $V^b$ will observe a frequency :$\backslash tfrac\backslash eta(N^a,V^b)$ Where $\backslash eta$ is the Minkowski inner-product (+---) Closely related to the four-frequency is the wave four-vector defined by :$K^a=\backslash left(\backslash frac,\; \backslash mathbf\backslash right)$ where $\backslash omega=2\; \backslash pi\; \backslash nu$, $c$ is the speed of light and $\backslash mathbf=\backslash frac\backslash hatN^a$ ==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「Four-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.