In topology, a branch of mathematics, a topological space X is said to be simply connected at infinity if for all compact subsets C of X, there is a compact set D in X containing C so that the induced map is trivial. Intuitively, this is the property that loops far away from a small subspace of X can be collapsed, no matter how bad the small subspace is. The Whitehead manifold is an example of a 3-manifold that is contractible but not simply connected at infinity. Since this property is invariant under homeomorphism, this proves that the Whitehead manifold is not homeomorphic to R3. However, it...

The White–Juday warp-field interferometer is a space warping experiment to detect a microscopic instance of a warping of spacetime with the intent of creating an Alcubierre warp bubble, if possible. A research team led by Harold "Sonny" White in collaboration with Dr. Richard Juday at the NASA Johnson Space Center and Dakota State University are conducting experiments but results so far have been inconclusive. An additional experiment with an EmDrive is showing interesting results. == Motivation for the experiment == The NASA research team led by Harold White and their university partner...