Le mer. 26 févr. 2025, 10:24, Alan Grayson <[email protected]> a écrit :
> > > On Wednesday, February 26, 2025 at 1:22:21 AM UTC-7 Alan Grayson wrote: > > On Tuesday, February 25, 2025 at 10:07:41 PM UTC-7 Brent Meeker wrote: > > On 2/25/2025 7:59 PM, Alan Grayson wrote: > > On Tuesday, February 25, 2025 at 6:40:35 PM UTC-7 Brent Meeker wrote: > > > > On 2/25/2025 3:48 PM, Alan Grayson wrote: > > > > On Tuesday, February 25, 2025 at 12:46:46 PM UTC-7 Brent Meeker wrote: > > I think all cosmologist, like Hartle, recognize that *the observable > universe* was much smaller in the past. Which is perfectly compatible > with *the universe* be spacially flat and infinite. > > Brent > > > I fully anticipated that response. But why would the observable universe > behave radically different from the entire principle, particularly in light > of the Cosmological Principle? AG > > It's not radically different. It's different in exactly the way that > finite subsets of infinite sets behave. > > Brent > > > But if the observable universe contracts to zero volume, the entire > universe has a singularity, which is inherently contradictory. So, the > model is, to say the least, inconsistent. AG > > It's not contradictory or inconsistent, it's unphysical, i.e. it can't be > physically realized; which just means the theory of general relativity > doesn't work there. This is not a surprise since GR is not a quantum > theory and if you're concerned with a subatomic scale region you'll > probably need a quantum theory. > > Brent > > > My conjecture is that there's a fifth force, repulsive in Nature, that > prevents the mass of a high mass collapsing star to reach zero volume. AG > > > I don't imagine a quantum theory. More important, I can't grasp the idea > of the observable universe contracting to zero or near zero volume as we go > backward in time, while the unobservable universe remains infinite in > spatial extent. Can you grasp it? Can you explain it? AG > 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. Quentin > -- > 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/24e6c716-8439-4d9d-96da-58d3529c30bfn%40googlegroups.com > <https://groups.google.com/d/msgid/everything-list/24e6c716-8439-4d9d-96da-58d3529c30bfn%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/CAMW2kAqzzdTtu%3DCHsaTs276ZbXjVMZT8Efeebn6fTm_Yuv6qcw%40mail.gmail.com.
