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I regard a relativistic vector:

$$

k^\mu =(k^0,k^1,k^2,k^3,)=(\frac{\omega_k}{c}, \vec{k} )

$$

What is [itex]|\vec{k}|[/itex] of this vector?

Is it the same as [itex]k^0[/itex]?

THX

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# Relativistic wave-vector k

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