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If gravity can bend light, why can't gravity slow light. At least momentarily? Wouldn't that give the illusion of the universe expansion speeding up?

user50238
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1 Answers1

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Light, all light, is composed out of zillions of photons, similar to observational fact that the flow of water in a river is composed out of zillions of molecules.

For light to slow it would mean that individual photons should slow, which is impossible within the known and well validated ( meaning tested a huge number of times and always found to be correct) framework of special relativity. Photons always travel with the speed of light, c, because they have zero mass. The only thing that can happen to a photon is a change in energy, which will either increase its frequency, since for photons E=h*nu, if energy is gained, or decrease it.

So your hypothesis

At least momentarily? Wouldn't that give the illusion of the universe expansion speeding up?

cannot hold.

anna v
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