
20220504: Space DOES NOT Expand Everywhere
 04:26: ...  at any one instant it’s a fair representation of a 2D slice out of a closed universe, and its growth represents the increase in the scale factor over ...


20220420: Does the Universe Create Itself?
 15:24: ...  close, open, flat  dictates the “temporal shape”. As in does a closed universe necessarily collapse, and an open one expand forever, and a flat one ...


20220323: Where Is The Center of The Universe?
 05:56: And that’s the most straightforward interpretation of the FLRW metric for a closed universe.
 06:21: In the case of the closed universe, that means it started out as a very, very tiny hypersphere surface and got bigger.
 07:39: ... line loops around the closed universe as the sphere shrinks, until eventually all points in the universe, ...
 09:52: In the case of the closed universe that’s easier to imagine  rewind the growing sphere and it approaches a single point at t=0.


20210126: Is Dark Matter Made of Particles?
 13:39: Would a spaceship traveling near the speed of light cause a closed universe to contract so much that it would smash into its own ass?


20210119: Can We Break the Universe?
 02:33: ... also imagine that we live in a closed universe  one that loops back on itself, so by traveling far enough you can get ...
 05:46: Our ultimate question is about a spaceship crashing into itself in a closed universe  and trust me we’re getting there.
 05:53: Let’s first look at the twin paradox in a closed universe.
 07:25: It seems that in this closed universe there IS a fundamental difference between frames of reference.
 07:54: In the case of the closed universe, that closed topology DOES pick out a special frame  it’s the one with these closed constant time loops.
 10:48: Does a nearlightspeed spaceship smash into it’s own rearend in a closed universe?
 11:01: ... happens to a ladder in a pacman barn, or a spaceship in a closed universe, when the barn or universe are length contracted to be smaller than the ...
 11:54: Long story short nearlightspeed spaceships in closed universes or ladders in pacman barns are safe from colliding with their own asses.


20191209: The Doomsday Argument
 16:21: ... some wisdom from Ethan Seigel, whose excellent Forbes article on this closed universe paper emphasized a point that we mentioned only in passing that is worth ...


20191202: Is The Universe Finite?
 01:02: ... Nature Astronomy paper that just reported this: Planck evidence for a closed Universe and a possible crisis for cosmology by Eleonora Di Valentino, Alessandro ...


20190403: The Edge of an Infinite Universe
 02:35: ... only type of noninfinite universe – or closed universe – is the one that curves back on itself – like a 3D analog of the 2D ...
