I'm not sure how cranky these notions of mine are ... but I figured Bad Astronomy would be a good place to set them up as a shooting target and see if there is anything left of it.
Brane Cosmology in a subset of M theory ( and also Quantum loop gravity theory ), that assumes that this universe was created in a collision between two adjacent (mem)Branes.
One of the things that struck me about this was that it could provide a cause for both Expansion, and the anti-matter problem. Specifically, if the stuff that became mass-energy was created by the collision, and the two branes collided at lightspeed in a cosmos-wise direction at two points that were "near" each other at the tops of very gentle curves, that the point of intersection would seem to expand and contract at a speed greater than C.
Not that anything was actually moving here, except two Branes vibrating at C ... the expansion of the intersecting area would merely seem to be "motion" at a speed greater than C.
If this intersecting area was exactly the distance of the initial Expansion, it would explain Expansion without invoking superluminal speeds.
( The odds of such a collision would need to be low enough for proton decay to clean up the evidence of the last collision, IMO. )
As for the anti-matter problem, maybe the directional bias of each Brane helped determine a bias between matter and antimatter? The Brane we collided with earlier might be a very hostile place to visit, and may have all of "our" anti-matter.
Dark Matter and post-big bang clumping:
Another feature of Brane theory, and the reason it was cooked up in the first place, was to explain gravitational force weakness by assuming leakage. Strong forces stay on this Brane, but weak ones like gravity leak.
This leakage generates an interesting question: Can a seriously attenuated gravity effect mass in adjacent Branes?
This would not be enough to cause immediate gross effects, but in aggregate, might cause large masses in adjacent Branes to slowly move "near" each other in a Cosmos-wise direction, and such stacks of differing galaxies and masses clumping up may cause matter in Branes undergoing early distribution of mass-energy to clump up near these.
Another effect would be that each galaxy sized object on a Brane would have many invisible companions on other Branes stacked up and contributing to each other's gravity wells. Perhaps enough to explain Dark Matter gravitation?
Anyway, thanx for taking the time to read some of my wild notions. If someone cooked these up earlier, he/she can take the blame as well.
astronomy dilettante, and Cheyenne Astronomical Society member.