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What is the four-momentum of a photon?

I saw online that the 4-momentum is [tex]P = m_{0}U[/tex] but then this leaves me with another question and that is, what is the four-velocity [tex] U [/tex] of a photon. I don't believe it exists because a photon is never at rest.

Can anyone help me with this? Many thanks beforehand for any advice and assistance.

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# Four-momentum of a photon

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