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## Main Question or Discussion Point

Hi, I'm trying to reconcile some general relativity stuff and I'm getting confused on a few topics.

Would someone be able to explain the properties of the four momentum of a photon? The way I understand it is that you take the four wave-vector of the photon and multiply it by [itex]\hbar[/itex]. The four wave-vector is simply [itex]\omega / c[/itex] as the zeroth compent and the 3-wave-vector as the spatial components. Right?

Now onto the four-momentum properties, how does the four-momentum of a photon change as it travels through spacetime? Are any components constant?

Thanks, I'll probably have follow up questions but I'd like to start with these

Would someone be able to explain the properties of the four momentum of a photon? The way I understand it is that you take the four wave-vector of the photon and multiply it by [itex]\hbar[/itex]. The four wave-vector is simply [itex]\omega / c[/itex] as the zeroth compent and the 3-wave-vector as the spatial components. Right?

Now onto the four-momentum properties, how does the four-momentum of a photon change as it travels through spacetime? Are any components constant?

Thanks, I'll probably have follow up questions but I'd like to start with these