On Thursday, September 5, 2019 at 1:38:38 AM UTC-6, Alan Grayson wrote: > > > > On Wednesday, September 4, 2019 at 4:06:53 PM UTC-6, John Clark wrote: >> >> >> >> On Wed, Sep 4, 2019 at 2:52 PM Alan Grayson <[email protected]> wrote: >> >> *> It's claimed the energy is undefined in GR. Regardless, what I am >>> trying to do is estimate what the total energy is, not whether it's >>> conserved for an expanding or contracting universe. AG * >>> >> >> You want to know the total energy of the universe during what time >> period? According to General Relativity the acceleration of the universe is >> caused by Dark Energy that is inherent in empty space, it works out to be >> about 10^-10 joules per cubic meter. But that acceleration means more cubic >> meters are constantly being created so, assuming General Relativity is 100% >> correct, the total energy in the universe will keep increasing forever. >> >> John K Clark >> > > I told you; I just want to estimate the total energy of the observable > universe, at any time t. I am not dealing with any conservation law, > although I grant you raise an interesting issue. Moreover, I think the > photons can be considered among the 10^80 particles, but clearly those > photons have energy h * f, and I assume we can assign some average > frequency to estimate the total contribution from those photons. AG >
It isn't clear, in a particle model for photons, why the reddening due to cosmic expansion is objectively the result of energy loss. In the case of reddening due to relative motion, Doppler effect, perhaps it's not an objective effect, but just from some reference frame or pov. 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 on the web visit https://groups.google.com/d/msgid/everything-list/718cc56b-cf49-423c-900b-639fa7b854ab%40googlegroups.com.
