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About: Four-frequency     Goto   Sponge   NotDistinct   Permalink

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The four-frequency of a massless particle, such as a photon, is a four-vector defined by where is the photon's frequency and 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 will observe a frequency Where is the Minkowski inner-product (+−−−) Closely related to the four-frequency is the four-wavevector defined by