
20191209: The Doomsday Argument
 14:06: ... finite or infinite because it may be that there's a slight positive or negative curvature just beyond the sensitivity of our ...


20191202: Is The Universe Finite?
 04:26: Rapid expansion tends to give negative curvature and open the universe  make it infinite.


20190410: The Holographic Universe Explained
 11:15: While the original space was flat, the new space had negative curvature – it was a hyperbolic, antide Sitter or AdS space.
 16:40: KI9 asks whether the things we learn from AdS/CFT are applicable to the universe we live in given that our universe doesn't have negative curvature.
 16:50: ... we don't know for sure that it doesn't have negative curvature  just that any curvature  negative or positive  is very weak compared ...


20190403: The Edge of an Infinite Universe
 03:25: Finally there’s the universe with negative curvature, and the 2D analog of that is the hyperbolic surface, like an infinite saddle or pringle.


20190220: Secrets of the Cosmic Microwave Background
 07:42: ... effect On the other hand an expanding universe with no energy would have negative curvature So a flat universe must have exactly the right amount of energy to ...


20190130: Perpetual Motion From Negative Mass?
 08:01: Negative mass causes negative curvature, which in our sheet analogy looks like pulling the sheet up.


20171108: ZeroPoint Energy Demystified
 05:36: That means the vacuum energy between Casimir plates still produces positive spatial curvature, not the negative curvature required for warp drives.


20160323: How Cosmic Inflation Flattened the Universe
 02:00: On a negative curvature hyperbolic plane a saddlelike structure they add up to less.
