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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/0a84eefd-80d2-4b95-bc43-a403d3302efa%40googlegroups.com.
