- #1
karlzr
- 131
- 2
condidering a photon in expanding cosmos, it 's said that the wavenumber k remains unchanged, the wavelength \lambda increases, proportional to the scale factor a(t) of the universe, and the frequency w decreases in the opposite way, that is the cosmic redshift.
so, why does k remain the same?
so, why does k remain the same?
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