Something that may be on the topic...
A while back I wrote in
Universe Expansion
Quote:
...It occurred to me that maybe the Branes didn't so much collide as merge. And maybe the merge is continuing. It seems to me that this could give us a universe that expands everywhere as the 2 Branes occupy the same location & maybe even provide the Inflation event as well as the more recent (IIRC) boost in expansion that we have observations that are suggesting.
If the 2 spacetimes are in a merger process we could see matter being created as part of the process so there'd be no central void, the 2 spaces could be intermixing to provide the expansion...
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If you have 2 Branes interpenetrating, you could have a mechanism for the 'push' effect as two spacetimes try to co-exist.
Also there's potential for the change in Universe expansion rate if the branes aren't regular shapes - the initial collision providing the original expansion that was slowing but then 'suddenly' a much large cross-section begins to merge forcing the kick in expansion rate.