Dear Bogie and Fortis,

Bogie: The redshift is caused by conservation of energy in a rescaling universe and E=hf. Because Plancks constant rescales according to h=h(0)exp(2Ht), then for energy to be conserved for a photon of light, its frequency must reduce as time passes.

Fortis: Good question. Energy does rescale according to E=E(0)exp(Ht), in the model. For ordinary masses the total energy remains zero. Gravity is the result of the conservation of energy in a rescaling universe, as follows.

The total energy due to any mass m is mc^2 - GmM/R, where the second term represents the combined contributions from all other masses up to the Hubble radius. So for conservation of energy mc^2 - GmM/R = 0

G=Rc^2/M and there is a natural solution of the flatness problem.

The photon was treated differently. It conserves its energy by changing frequency, no time passes for it, so its energy remains constant.

John Hunter.

P.S for Fortis, On the point about two atoms emitting photons at different times, I agree with you that they would emit photons of different energies. But this is what we see. Two photons arrriving from different stars, one emitted later (from further away) than the other, arrrive with different redshifts.