Definition of Four-frequency
The four-frequency of a massless particle, such as a photon, is a four-vector defined by
{\displaystyle N^{a}=\left(\nu,\nu {\hat {\mathbf {n} }}\right)}
{\displaystyle {\hat {\mathbf {n} }}}
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Frequently asked questions
What is Four-frequency?
The four-frequency of a massless particle, such as a photon, is a four-vector defined by