“Four-frequency”的意思、由来-开放百科全书

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Four-frequency

释义

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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

where , is the speed of light and and is the wavelength of the photon. The four-wavevector is more often used in practice than the four-frequency, but the two vectors are related (using ) by

References

*{{Cite book |title=Special Relativity |last=Woodhouse |first=N.M.J. |authorlink= |coauthors= |year=2003 |publisher=Springer-Verlag |location=London|isbn=1-85233-426-6 |pages= }}

1 : Four-vectors

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