On 1/22/2020 6:38 PM, Alan Grayson wrote:
On Wednesday, January 22, 2020 at 1:34:00 PM UTC-7, Lawrence Crowell
wrote:
On Wednesday, January 22, 2020 at 11:33:04 AM UTC-6, John Clark
wrote:
On Wed, Jan 22, 2020 at 12:06 PM Lawrence Crowell
<[email protected]> wrote:
> /It is then possible to have an expanding accelerated
cosmos that is spherically closed./
So if I keep going I will eventually return to where I started
even though everything is constantly getting more distant from
me and is doing so at an accelerating rate?
John K Clark
For an accelerated expansion of the sphere there is a cosmological
horizon that one can't cross. in other words, the sphere will keep
expanding faster than you can ever go. Think of the scene in the
movie "/The Shining/" with Jack Nicholson where the hotel hallway
telescoped away faster than he could run.
LC
I don't think it depends on acceleration. As long as the universe
expands, even at a constant rate, at some distance, the distance
between, say, an Earth observer, and some terminal point along a line
of sight, will exceed 300,000 km (the distance light travels in one
second) and points beyond that will keep increasing the increment
every second, creating a cosmological horizon that light cannot cross.
That's not quite right. Light can cross it just fine. But a photon
crossing it toward us, can never reach us. This is how the Hubble
boundary differs from a black hole event horizon.
Brent
This is because the creation of the horizon is purely a geometric
effect of the expansion, and the rate of expansion is irrelevant. AG
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