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this post was submitted on 23 Nov 2023
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Agreed on all points.
The gravity drag would be tiny however. The gravitational gradient in deep space is tiny, it's being dragged forward almost as much as backwards. Further, (with a 2 mass approximation) it's reliant on both masses. The equivalent mass of a photon is via E = MC^2 . Therefore M=E/C^2 . Plug the numbers and this Uber photon weighs 4.45x10^-17 kg. Stupidly huge for a subatomic particle, stupidly tiny for a relativistic mass.
Depending how far it's travelled, it likely has more loss from the universe expanding. Unfortunately, I can't remember the equations for that however.
The main point is that, beyond these effects, there is no slowdown. It either flies at full speed, or hits something and creates a cascade of far slower (boring) particles.
Thanks! I learned a lot in this discussion!