On 1/5/2025 1:03 PM, Alan Grayson wrote:
On Sunday, January 5, 2025 at 2:00:46 PM UTC-7 Alan Grayson wrote:
On Sunday, January 5, 2025 at 1:49:59 PM UTC-7 John Clark wrote:
On Sun, Jan 5, 2025 at 2:45 PM Alan Grayson
<[email protected]> wrote:
/> his answer to energy requirements for these new worlds
seems weak, that energy is somehow globally conserved
while the energy in particular branches can decrease,/
*It doesn't matter if Many Worldsis correct or not,we've known
for a century that in an expanding universe, like the one we
live in, energy is NOT conserved at the cosmological scale;
photons of light gets stretched to the red end of the spectrum
and red photons have less energy than blue photons. In fact,
unlike classical physics or even special relativity, the very
concept of conservation of energy is not rigorously defined in
General Relativity. GR does have something called the
"stress-energy tensor" that includes contributions from all
non-gravitational fieldsand matter, but gravity is not
included. If you're interested Sean Carroll goes into much
more detail here: *
*
*
*Energy Is Not Conserved*
<https://www.preposterousuniverse.com/blog/2010/02/22/energy-is-not-conserved/>
*John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>*
How could gravity be included as if it's something different from
curvature of spacetime, which is caused by stress-energy tensor?
I'm pretty sure Carroll said energy is conserved in the MWI,
making it superior to the Copenhagan interpretations. AG
If photons are losing energy as the universe expands, where does the
lost energy go? AG
It goes into the expansion of the universe. If the expansion reverses
and the universe collapses those photons will become blue shifted and
the energy will be recovered. Since it's not expected to collapse the
energy is effectively lost.
Brent
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