On Wednesday, April 9, 2025 at 6:14:52 PM UTC-6 Brent Meeker wrote:
On 4/9/2025 4:42 PM, Alan Grayson wrote: On Thursday, April 3, 2025 at 12:48:49 AM UTC-6 Alan Grayson wrote: On Wednesday, April 2, 2025 at 6:03:49 AM UTC-6 Alan Grayson wrote: On Wednesday, April 2, 2025 at 5:21:27 AM UTC-6 John Clark wrote: On Wed, Apr 2, 2025 at 6:36 AM Alan Grayson <agrays...@gmail.com> wrote: *> If the universe has no boundary, then one cannot determine what the CC could be, since such a calculation requires a boundary.* *No, it doesn't. * Brent implies otherwise. Are you saying you can get a definite solution from a set of differential equations without a boundary condition? AG The boundary condition for the universe is its present state and it's not finite. Brent How do you* know *that? ISTM, you're speculating and misrepresenting your speculation for knowledge. Data from the Planck spacecraft isn't conclusive. AG *> I don't see that the CC has any relationship to gravity. AG * *Sorry to hear that, I guess you'll have to study physics and cosmology more deeply. * That's a reply from someone who insists on being a prick. Choose an evolution of the universe you prefer, and you can find a CC that does that for you. AG *John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis>* I think I get it. You're learned about physics and cosmology and I'm a know-nothing schmuck who asks stupid questions. *OR*, maybe you're a *pretentious fool* who thinks he knows much more than he really knows? If you're so learned about these arcane subjects, then maybe you can shed some light on my question, *assuming you in fact understand it*. Firstly, gravity isn't causing the universe to expand. At most, it's causing the rate of expansion to decrease, at least that was the understanding until around 1990. So, if Einstein determined a value of the CC which caused the expansion to cease, resulting in a steady state universe, why would anyone associate that value of the CC as having anything to do with ANTI-GRAVITY? Remember, *GRAVITY, WHICH IS ATTRACTIVE, CANNOT BE THE CAUSE OF THE EXPANSION, SO ANY CC WHICH CEASES THE EXPANSION, HAS NOTHING TO DO WITH GRAVITY! AG* The point I was trying to make, might have been too suble for you to grasp. so you, JC, defaulted to insults. Einstein initially set the CC to zero, and when it was determined that his field equations predicted an expanding universe, he reset it to a positive value, presumably to make gravity stronger so the effect of the positive CC and gravity would produce a static universe. In this situation, the CC would *augment *the attractive force of gravity. Later, when E was convinced that the universe is expanding, he reset the CC back to zero. In 1990, when it was discovered that the rate of expansion was in fact increasing, the CC was re-introduced in his field equations, this time to *oppose* the attractive force of gravity, using "dark matter" as a placeholder for the cause of the increase in the rate of expansion. So, it is natural to imagine the CC as related to gravity, and to think of it as a force, notwithstanding the revisionist concept of a *force* in GR, when E's happiest thought was to realize that gravity isn't a force. In any event, the point in my preceding post is that the *cause *of the expansion of the universe seems totally unrelated to gravity -- I've never seen any argument affirming that gravity *IS* related to the expansion, other than slowing its rate -- so anything beyond gravity that effects the expansion might be independent of gravity. Finally, it would be nice if one could speculate here without being the subject of a pissing contest. 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/7692626d-d336-449f-a78e-0ae61e4e23e6n%40googlegroups.com <https://groups.google.com/d/msgid/everything-list/7692626d-d336-449f-a78e-0ae61e4e23e6n%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/ce8c0172-2678-4819-a8b2-2041fdc52456n%40googlegroups.com.
