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
<[email protected]> 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
/> 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
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