Can Photons Travel the Same Path at Different Speeds?

[y2kmisty2000]

A quick question, let's just say that my friend and I became photons, and were emitted from a light source in the same direction 1 second apart. My photon friend would never catch up to me, right? Am I correct to say that I wouldn't even be able to tell that he was following me since his information would never catch up to me?

 

[Meir Achuz]

Yes...

 

[DaveC426913]

Before you get too much further, you must live with the fact that photons cannot have a frame of reference. It is meaningless to ask what a photon experiences, even in principle.

This may not seem relevant, but as this question continues, you will surely find this post being referred to.

 

[MeJennifer]

A quick question, let's just say that my friend and I became photons, and were emitted from a light source in the same direction 1 second apart. My photon friend would never catch up to me, right?

That would be true in flat spacetime but not necessarily true in certain curved spacetimes.