AG, temperature follows density. As density increases indefinitely, so does temperature. Expansion rate doesn’t need to be infinite, compression alone drives temperatures to extreme levels.
Quentin Le dim. 2 mars 2025, 08:11, Alan Grayson <[email protected]> a écrit : > > > On Saturday, March 1, 2025 at 4:02:15 PM UTC-7 Quentin Anciaux wrote: > > On the 26th and in other replies I did say: > > As I've explained already, it's not that the volume goes to zero, but > density that goes to infinity, everywhere, there is no valid notion of > volume in an infinite universe. > > What is difficult to understand? > > Quentin > > > I deleted that post. You must have replied to your email list. But you > misconstrued the question posed. As the density goes to infinity, the rate > of expansion keeps increasing (but not to infinity), so how do the > competing rates result in an ultra high temperature? I suppose it's because > the first is unbounded and latter bounded. AG > > > > Le sam. 1 mars 2025, 06:42, Alan Grayson <[email protected]> a écrit : > > > > On Friday, February 28, 2025 at 1:22:43 PM UTC-7 Brent Meeker wrote: > > > > On 2/27/2025 10:59 PM, Alan Grayson wrote: > > > > On Thursday, February 27, 2025 at 4:17:13 PM UTC-7 Brent Meeker wrote: > > > > On 2/26/2025 11:39 PM, Alan Grayson wrote: > > > > If we assume an infinite universe and run the clock backward, is it > reasonable to conclude that the singularity we imagine forming in the > observable region, > > The singularity is not IN the observable region, it is the limiting origin > of the observable region. > > is identically the same singularity for the entire universe? Secondly, why > do we imagine the hypothetical singularlty indicates the GR fails in this > situation? After all, if the expanding universe is determined by > measurements, and the average distances between galaxies decreases as the > clock runs backward is also determined by measurements, what has this to do > with GR, since it's all measurement determined? TY, AG > > You can't be so dense as to not know the difference between a measurement > and an extrapolation. > > Brent > > > I'm just saying that measurements suggest a singularity without applying > GR. The reason the unobservable region is unobservable is because expansion > in that region is faster than light speed. So if we run the clock backward, > won't that region collapse faster than light speed, with the result that > the entire universe converges to a single singularity? AG > > It depends I suppose on what "run the clock backwards" means. It's > unphysical to have spheres of outgoing radiation contract backward to a > point as in playing a video backwards. But if that's what you mean then > yes the entire universe becomes infinitely dense, a singularity...but not a > point, it's still infinite. > > Brent > > > So, as we go backward in time, the observable universe seems to converge > to a point, while the rate of expansion of the unobservable universe > increases since the rate of expansion in earlier times was greater than it > is at present? In this scenario, how could the unobservable univese reach > an ultra high temperature as we approach the BB? 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 [email protected]. > > To view this discussion visit > https://groups.google.com/d/msgid/everything-list/629ffae7-7336-4bc5-bb65-54e18e288147n%40googlegroups.com > <https://groups.google.com/d/msgid/everything-list/629ffae7-7336-4bc5-bb65-54e18e288147n%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 [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/everything-list/89941b02-58f3-49a2-8f97-49fa0e1f1e99n%40googlegroups.com > <https://groups.google.com/d/msgid/everything-list/89941b02-58f3-49a2-8f97-49fa0e1f1e99n%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 [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAMW2kAqBRmaYWa8%3D%2BC7W1XGs6LcfRfs0-i%3Dok0fsrM5oGYomZQ%40mail.gmail.com.
