On Thursday, January 23, 2020 at 4:56:08 PM UTC-7, John Clark wrote: > > On Thu, Jan 23, 2020 at 6:35 PM Bruce Kellett <[email protected] > <javascript:>> wrote: > > >> *> You seem to have missed an important little word in Brent's post: >> Brent talked about needing an infinite RANGE of coordinate values for an >> infinite universe* >> > > OK fine, so in a finite universe you'd only need a finite RANGE of > coordinate values printed on a finite number of labels for all the finite > number of points in that finite universe. But as I said, if new points are > constantly being made at an accelerating rate in that "finite" universe > then you're going to run out of those finite labels. > > > *nothing whatsoever about having only a finite set of distinguishable >> labels......* >> > > Nothing whatsoever? He specifically said a "range of coordinate values to > *label* all the points". And if a label isn't distinguishable then it > isn't a label. > > John K Clark >
But they are distinguishable. Moreover, accelerating expansion is irrelevant. A constant rate of expansion produces non-observable regions for every observer. As for using a single time label for the whole universe, doesn't GR do just that in its scale factor "a", which is a function of one variable, t, time. Admittedly, this seems to violate the concept in relativity that each observer has its own clock. No doubt someone here can rationalize this apparent anomaly in relativity. 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/5b0d70d5-0cc1-453f-b81e-83fc625260d6%40googlegroups.com.
