And interesting...but how about going to the other external region the other way- via electromagnetic energy (photons)? Why is it necessary to time travel through a black hole? Since time ceases to pass from the R-frame of a photon, the trip to the other side would be just as quick going around the "long way".

INTERJECTION: It was pointed out to the author that photon paths are at 45 Degrees on the hyperspheres...they don't go "out" except from our 4D frame. Rather photons duck back in at the singular antipodes forcing us to traverse singularity. This characteristic graphically portrays 1. The omnipresence of the submicroscopic and astronomical, "Big Bang" antipodes, 2. The ultimate smallness of the universe and 3. the role of singularity in rigidly organizing and eternally structuring the GR universe.

Who's going anywhere in a Geometric Universe anyway? Nothing gets lost. We are all fixtures. The process of creation, evolution and change in GR is very subtle, much more subtle I think than we can conceive. Observed by photons in 4-D, things in the universe seem to move, for we "see" only a continually changing sequence of cross sections of the linear time dimension. In 7-D the universe is almost frozen. At 11D change takes an eternity...kind of like a gearbox!

If the universe exists in exponential D, we really have a stable reality on our hands! Quite a difference from what we observe casually in 4-D...but go somewhere? Hardly

Regards, Sam Cox