Timeline for Can a photon that is emitted from a denser part of the universe to a less dense part appear redshifted?
Current License: CC BY-SA 3.0
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| Feb 11, 2019 at 16:11 | vote | accept | Muze | ||
| Dec 11, 2016 at 16:55 | comment | added | John Duffield | Rob : the important point is that the redshift is observed. When I accelerate you in free space away from a photon source you observe a redshift because you changed, not because the photons changed. In similar vein when I lift you up in a gravitational field away from a photon source you observe a redshift because you changed, not because the photons changed. | |
| Dec 11, 2016 at 15:44 | history | edited | ProfRob | CC BY-SA 3.0 |
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| Dec 11, 2016 at 15:35 | comment | added | ProfRob | There is no contradiction in that. I will change my wording slightly to avoid giving the impression that the redshift is something "experienced" by the photon. | |
| Dec 11, 2016 at 14:14 | comment | added | John Duffield | This answer suggests that the descending photon somehow gains energy. It does not. If you send a 511keV photon into a black hole, the black mass increase is 511keV/c². | |
| Dec 11, 2016 at 10:14 | history | edited | ProfRob | CC BY-SA 3.0 |
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| Dec 11, 2016 at 10:08 | history | answered | ProfRob | CC BY-SA 3.0 |