It's funny how some of the more advanced cosmological theories sound as if they came straight from the minds of stoned teenagers. To wit: http://en.wikipedia.org/wiki/One-electron_universe

The universe is a strange place indeed.

Sure, it's one interpretation and a solution to the Black hole information paradox. But I don't like to talk about space without time, preferring this solution http://en.wikipedia.org/wiki/Black_hole_information_paradox#...

You can talk about space without time though you can't talk about changes of information (i.e.: movement through space) without time.

> They are negatively curved, any object thrown away on a straight line will eventually return.

Isn't that describing positive curvature (e.g. a sphere)?

The inside of a sphere. http://i.imgur.com/b2KgM6X.gifv

That was really interesting, do you have a source? (The title makes it seem like a joke though)

Google Hollow Earth. There are many conspiracy theory sites handling it, but I think it is a quite interesting concept nontheless.

No, paraboloid also has positive curvature. Sign of curvature refers to whether all curves at a point are in the same half-space (saddles have negative curvature).

OP really means something like "eccentricity <1"

Why it should be 2D? Three-dimensional hologram would totally works for us. Something like The Matrix and 13th Floor combined... You have everything in 3D around you and just a tiny part of the Universe (where you are currently looking at), because it is not possible to simulate the full Universe (the energy since the Big Bang till now won't be enough).

All holograms only have 2 dimensions. They "trick" us into thinking the image you are seeing in the hologram has 3 dimensions. The idea behind the Universe being a hologram is that everything exists in flat space; however, it appears to us as being in 3 dimensions. Think of a video game, where you are moving around in a 3d world, but it's not really 3d, it just "feels" like it is.

ever been diving? feels pretty much as 3D as you would expect

Anyone interested in this can find an excellent lecture here http://m.youtube.com/watch?v=dEaecUuEqfc and of course by looking up leonard susskind's stuff on the black hole wars and universe as a hologram

yes leonard susskind's stuff on this is excellent!

What will happen when photons reach the outer boundary of the universe? Where time and space starts to slow down ... Will the photon also slow down, and then take an elliptic path? Might explain why the universe seem to expand in all directions.

I don't think it really applies in this case? It's pointing out a new scientific theory that raises a question. The author isn't poising a question him/herself

Wheelerian thought should never be down-voted.

Memory is in 3rd person.

This is entirely irrelevant.