For starters, there is the covariant vector(adsbygoogle = window.adsbygoogle || []).push({});

(E/c,p).

Dividing by the scalar invariant, h_bar/2∏, where k is the propagation vector, there is

(ω/c,k).

There must be a significant number of covariant objects in electromagnetism...

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# What Lorentz Covariant Objects Can You Name?

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