On 2/27/2025 10:59 PM, Alan Grayson wrote:
It depends I suppose on what "run the clock backwards" means. It's unphysical to have spheres of outgoing radiation contract backward to a point as in playing a video backwards. But if that's what you mean then yes the entire universe becomes infinitely dense, a singularity...but not a point, it's still infinite.On Thursday, February 27, 2025 at 4:17:13 PM UTC-7 Brent Meeker wrote: On 2/26/2025 11:39 PM, Alan Grayson wrote:If we assume an infinite universe and run the clock backward, is it reasonable to conclude that the singularity we imagine forming in the observable region,The singularity is not IN the observable region, it is the limiting origin of the observable region.is identically the same singularity for the entire universe? Secondly, why do we imagine the hypothetical singularlty indicates the GR fails in this situation? After all, if the expanding universe is determined by measurements, and the average distances between galaxies decreases as the clock runs backward is also determined by measurements, what has this to do with GR, since it's all measurement determined? TY, AGYou can't be so dense as to not know the difference between a measurement and an extrapolation. BrentI'm just saying that measurements suggest a singularity without applying GR. The reason the unobservable region is unobservable is because expansion in that region is faster than light speed. So if we run the clock backward, won't that region collapse faster than light speed, with the result that the entire universe converges to a single singularity? AG
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