Recent content by vsemenov

Thanks. So propagation through expanding space has to be treated with GR, and currently conservation of energy is undefined in GR. So energy loss in cosmological redshift is either not a problem or unknown?

This might be a tired topic but please help me to understand. Assume a photon moving in vacuum, ignore potential interstellar medium absorption and re-emission since it is not relevant to discussion of space expansion in this context. Redshifted photons will undergo energy loss between *right...