On 2/26/2025 12:22 AM, Alan Grayson wrote:
On Tuesday, February 25, 2025 at 10:07:41 PM UTC-7 Brent Meeker wrote:
On 2/25/2025 7:59 PM, Alan Grayson wrote:
On Tuesday, February 25, 2025 at 6:40:35 PM UTC-7 Brent Meeker wrote:
On 2/25/2025 3:48 PM, Alan Grayson wrote:
On Tuesday, February 25, 2025 at 12:46:46 PM UTC-7 Brent
Meeker wrote:
I think all cosmologist, like Hartle, recognize that
/the *observable* universe/ was much smaller in the
past. Which is perfectly compatible with /the universe/
be spacially flat and infinite.
Brent
I fully anticipated that response. But why would the
observable universe behave radically different from the
entire principle, particularly in light of the Cosmological
Principle? AG
It's not radically different. It's different in exactly the
way that finite subsets of infinite sets behave.
Brent
But if the observable universe contracts to zero volume, the
entire universe has a singularity, which is inherently
contradictory. So, the model is, to say the least, inconsistent. AG
It's not contradictory or inconsistent, it's unphysical, i.e. it
can't be physically realized; which just means the theory of
general relativity doesn't work there. This is not a surprise
since GR is not a quantum theory and if you're concerned with a
subatomic scale region you'll probably need a quantum theory.
Brent
My conjecture is that there's a fifth force, repulsive in Nature, that
prevents the mass of a high mass collapsing star to reach zero volume. AG
But the reason GR predicts a singularity is that all forces contribute
to mass-energy density and the higher the density the higher the
curvature (that's Einstein's equations). So adding a repulsive force
just makes the singularity more certain; still with the caveat that this
is a classical equation.
Brent
--
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 everything-list+unsubscr...@googlegroups.com.
To view this discussion visit
https://groups.google.com/d/msgid/everything-list/8a868401-caf7-4165-b25d-5574e311f8a7%40gmail.com.