I've just joined the forum, so I am a little clueless. Since you have read "Hyperspace", which even I have, I thought maybe I could put my thoughts...
Michio Kaku says that originally the universe was 10 dimensional and later it divided into two universes- our 4-D world and another 6-D world.
Now, since the dimension of time has come into our universe, does it not imply that the 6-Dimensional universe is in a steady state, i.e. in exactly the same form as it was at the time of the division, since time has not passed there.
Comments awaited...