On Saturday, January 18, 2020 at 6:04:53 PM UTC-6, Alan Grayson wrote: > > > > On Saturday, January 18, 2020 at 2:55:16 PM UTC-7, Brent wrote: >> >> >> >> On 1/18/2020 1:29 AM, Alan Grayson wrote: >> >> *the infinite spatial extent must have occurred instantaneously, at the >> BB.* >> >> >> It doesn't have to "occur". If the universe is infinite then it didn't >> become infinite, it was always (in some timeless way) infinite. The >> equations of cosmology are just for a scale factor. We estimate the >> parameters from observation and project back to a beginning. So there's >> really no sense in projecting back to zero scale factor...there the size of >> a flat universe according the equations is infinity*zero. Hopefully a >> quantum theory of gravity will replace that oo*0 with something more >> sensible. >> >> Brent >> > > What do "infinity*zero" and "oo*0" mean? I see your point. My problem is > that we seem to have a universe with a BEGINNING, called the BB, and I find > it virtually impossible to imagine it starting with an infinite spatial > extent. How could "nothing" become infinite in any parameter, suddenly, or > due to finite processes? What I can imagine is it emerging from something > flat and eternal, having an infinite past. AG >
Any theory (of physics/cosmology) that *asserts the existence of infinite anythings* as an "axiom" or starting point has no basis of any support by empirical data. (That I am aware of.) So it seems useless to even talk about them. @philipthrift -- 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 on the web visit https://groups.google.com/d/msgid/everything-list/0a84eefd-80d2-4b95-bc43-a403d3302efa%40googlegroups.com.
