In article ,
Eric Flesch writes:
If we fill the bulk with n-space
matter & energy, so we are just a sub-universe of the larger universe,
then stability follows as naturally as the stability of standing on
the Earth.

Sorry, but I'm afraid I don't follow that. Objects in our universe
are strongly affected by gravity, and that's unstable. (Density
fluctuations grow with time, not damp out.) How does having a
"larger universe" change that?

Again no hurry to answer, but this is the sort of question you'll
eventually need to face.

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