On Monday, January 13, 2020 at 5:39:47 AM UTC-7, John Clark wrote: > > On Mon, Jan 13, 2020 at 5:10 AM Alan Grayson <[email protected] > <javascript:>> wrote: > > *> if our bubble has a finite age and is expanding, it must be finite in >> spatial extent since the expansion rate is finite.* > > > Space would not have to expand infinitely fast just faster than light, and > that is allowed under General Relativity, in fact that is exactly what > Inflation hypothesizes. If that is indeed the case then no matter how fast > 2 particles are moving away from each other they can keep getting further > and further apart forever and never meet each other again. And that's what > a universe with infinite spatial extent means. > > John K Clark >
*While GR allows expansion faster than the SoL, this is NOT a necessary condition for one particle to enter the non-observable region from another particle's pov. All that's needed is for the expansion to continue long enough. This is because the winking out is purely a geometric effect of the expansion. 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 on the web visit https://groups.google.com/d/msgid/everything-list/5a9fd22e-d607-41e1-bb95-b71e184c7a13%40googlegroups.com.
