Are there names for the Lorentz invariant norm of the four-potential and four-current? I assume that they are invariant under the transformations. Also, is it true that any physical quantities which form a four-vector have an invariant quantity associated with them (i.e. the norm of the corresponding four-vector)? Thanks.(adsbygoogle = window.adsbygoogle || []).push({});

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# 4-vector norm names

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