Ethan Siegel just seems to be using non-standard terminology here to express the same results that have been known for a long time--he says that what he means is that "the expansion rate — also known as the Hubble constant/parameter — still decreases" even though "each individual object that’s receding from us will recede at faster and faster speeds as time goes on". If you look at https://en.wikipedia.org/wiki/Accelerating_expansion_of_the_universe#Technical_definition they say that cosmologist typically define "accelerating expansion" to mean the second derivative of the scale factor a(t) is positive, meaning the scale factor is increasing with time, and https://en.wikipedia.org/wiki/Hubble%27s_law#Time-dependence_of_Hubble_parameter notes that it's quite possible for the scale factor a(t) to increase with time while the Hubble parameter H(t) is decreasing, and in fact that's what observations suggest is happening (as Siegel points out). The article even notes that one implication of this is that "The recession velocity of one chosen galaxy does increase, but different galaxies passing a sphere of fixed radius cross the sphere more slowly at later times".
On Sat, Jan 7, 2023 at 7:38 PM spudboy100 via Everything List < everything-list@googlegroups.com> wrote: > So who the hell is messing with the universe!?? Oh, ok, sorry sir! > > WTF? The Universe's expansion rate isn't accelerating? - Big Think > <https://bigthink.com/starts-with-a-bang/universe-expansion-not-accelerating/> > > Seems, that, if accurate, the universe is altering things, or more, > likely; our equipment is getting better, and we are thus obtaining more > accurate results? Or is the Universe aware and likes to communicate with > astronomers and physicists and is trying to get their attention? The > Autodidactic Universe - INSPIRE (inspirehep.net) > <https://inspirehep.net/literature/1856792> > > Me not know because me just a slobbering, peasant-serf type, a-slobbering > over various science articles in mindless, incredulity. > Hey, if this is correct, then, God really likes the smart people. This > should cheer you all up. > > -- > 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/2074755747.3567665.1673138289826%40mail.yahoo.com > <https://groups.google.com/d/msgid/everything-list/2074755747.3567665.1673138289826%40mail.yahoo.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 everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAPCWU3LwCAUE0FLZtLG6ZatUJFDbVUGHtW8FXK-Yhrmz7SsD%3Dw%40mail.gmail.com.
