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 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 -- 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-li...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/everything-list/a012aae4-1174-46c6-998c-c08aaca0e952n%40googlegroups.com <https://groups.google.com/d/msgid/everything-list/a012aae4-1174-46c6-998c-c08aaca0e952n%40googlegroups.com?utm_medium=email&utm_source=footer> . -- 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/21d2fa87-e491-46e1-ba99-2a0cfed645een%40googlegroups.com.
