On Sunday, November 9, 2025 at 2:14:22 PM UTC-7 Brent Meeker wrote:
Forget GR. Ask yourself where would it go in an expanding Newtonian universe? Brent *My conjecture is that the lost energy is absorbed into the surrounding space. To claim it "disappears" is to indulge in magic. AG * 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 -- -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/d6ed1805-106a-4d27-85ab-089e43510ae2n%40googlegroups.com.
