light
what are the way/ways is/are there to:
change lights frequency?
increase/decrease redshift?
cosmic expansion and Doppler effect are two ways.
what else?
Compton scattering.
https://en.wikipedia.org/wiki/Compton_scattering
I should also include gravitational redshift which is related to those you have already mentioned.
https://en.wikipedia.org/wiki/Gravitational_redshift
See ARXIV guidelines on who can introduce submissions.
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