Forget GR. Ask yourself where would it go in an expanding Newtonian
universe?
Brent
On 11/9/2025 1:37 AM, Alan Grayson wrote:
Since photons are redshifted as the universe expands, this is offered
to support the claim that energy is not conserved in GR. When I asked
where the lost energy goes, the answer offered is that it
"disappears". I find this answer woefully insufficient for the
following reason: if energy in GR is not conserved, it just means that
a photon's energy changes as the universe expands. No matter at what
time in the evolution of the universe, the photon's energy remains
unchanged*if it's conserved*. That is, conservation of energy means
the photon's energy remains unchanged. It doesn't say the lost energy
"disappears". So the open question IMO is this; where does the lost
energy go, and GR does not answer this question. AG --
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