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, 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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