In Doppler or Hubble red shift, the wavelength reached us is longer than the original wavelength, as a result, according to the Planck relation, its energy has decreased.
Where does this energy go? Isn't this against the law of conservation of energy?
The idea that I have for this question is that energy is a geometric object, and the energy that we measure through the Planck relation equation is just the representation of that geometric object by our basis vectors, and these basis vectors change due expansion of the universe, this energy does not go anywhere, only its representation is changed by our basis vectors. Is this true?
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