On Tuesday, March 11, 2025 at 12:48:31 AM UTC-6 Alan Grayson wrote:
On Tuesday, March 11, 2025 at 12:33:36 AM UTC-6 Brent Meeker wrote:
On 3/10/2025 11:04 PM, Alan Grayson wrote:
On Monday, March 10, 2025 at 11:15:07 PM UTC-6 Brent Meeker wrote:
On 3/9/2025 11:14 PM, Alan Grayson wrote:
I don't think you understand my question. Without a CC, or equivalently
setting it to zero, don't we get a universe which is in UNSTABLE
equilibrium, like balancing a pencil of its writing tip, so the universe
expands or contracts in a very short time interval? Isn't this the issue
Einstein faced? If so, why would he choose a positive CC? AG
No, Einstein's model with the CC=0 was static. The model when I was in
grad school was an expanding universe with the CC=0 but the expansion
kinetic energy was just balanced by the negative gravitational potential,
so the universe would expand forever but slowing asymptotically toward
static.
Brent
Now I am totally confused. If E's model was static with CC=0,
Sorry, I miswrote. I intended to say Einstein had to make the CC>0 in
order to balance the gravitational attraction.
Brent
OK. Does setting CC>0 result in unstable equilibrium as I think Clark
claimed, and discovered by Arthur Eddington? IOW, will the universe
suddenly contract if it is expanding? AG
Maybe Clark meant that setting CC>0 results in a static universe, which is
in unstable equilibrium, meaning that it will suddenly expand or contract?
AG
it agreed with what astronomers thought in 1915, so why would he add a
positive CC, tantamount to a repulsive force as you earlier claimed, to
counteract what he then thought was a false prediction of GR of an
expanding universe? Does anyone have a coherent answer to what's going on
with the CC? AG
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