On Saturday, January 25, 2025 at 12:11:15 PM UTC-7 Jesse Mazer wrote:
On Sat, Jan 25, 2025 at 1:57 PM Alan Grayson <agrays...@gmail.com> wrote: On Saturday, January 25, 2025 at 6:57:27 AM UTC-7 John Clark wrote: On Sat, Jan 25, 2025 at 5:11 AM Alan Grayson <agrays...@gmail.com> wrote: *> IIUC,* *According to Google, that means the "International Islamic University Chittagong", but it must not understand correctly.* * > it's based on the assumption that the universe is infinite in spatial and temporal extent, but this is mistaken.* *You're right, that is mistaken, so it's fortunate that Hugh Everett did not make that mistake. By the way, I don't feed trolls so if I hear any of that "Trump physics" crap this conversation is over.* *> Our universe, by which I mean our bubble, is finite.* *In Hugh Everett's Many Worlds theory the word "bubble" has no meaning although that word does have meaning in "Eternal Inflation" and in the "String Theory landscape", but as far as Everett's Many Worlds is concerned they are irrelevant, they may or may not be true.* *i call it a Bubble to suggest an approximately spherical shape, which is implied by the Cosmological Red Shift, which has approximately the same value in every direction. So its shape is like a somewhat distorted sphere. AG * *Max Tegmark has proposed 4 different types of "Many Worlds"* *1) A spatial extension of our observable universe, perhaps by an infinite number of light years or perhaps by just an astronomical number of light years. * *Falsified by the data, the age estimate of the universe. AG * If the universe *were* infinite spatially (or at least much larger than the observable region), but still began in a Big Bang a finite time in the past (or at least we could not receive light signals from before then, even if there was something before as in 'eternal inflation' theories), do you think the observational data would be any different? Assuming a finite speed of light, the observable region would still be a finite size in this scenario, no? Jesse *You pose a compound question, so hard to answer. I am just dealing with our Bubble, nothing to do with Eternal Inflation. And within our Bubble, or any Bubble, I think the observable universe will be finite since the SoL is finite. Also, the unobservable part is estimated to be hugely larger, some estimates are 200 times larger but I'm not sure if that refers to its volume or radius. But with a finite age, it cannot evolve to infinity in spacial extent, no matter how fast it expands. That condition could only exist IMO if that was its initial condition. But as I wrote, that would be imposing another infinity on the BB (aside from infinite density at T=0), which again, IMO, is highly dubious. I'm not sure I answered your question, so you might have to rephrase it. 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 everything-list+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/everything-list/108923d4-b2c0-4e4b-91d8-ea6642521e71n%40googlegroups.com.
