black holes , gravity theory and M theory

[Brether]

According to the theory of Lisa Randall the gravity is leaking from another dimension towards ours , beeing stronger in
the other dimension and weakening as it enters ours. Seeing that almost, if not all galaxies have a black hole in the middle
and according to M theory that matter was created by another universe coliding with ours , could it be that the black holes,
, where gravity manifests in a stronger way, are the points where the two universes colided ?

[Cougar]

....according to M theory that matter was created by another universe coliding with ours , could it be that the black holes,
, where gravity manifests in a stronger way, are the points where the two universes colided ?

If black holes are where the brane universes collided, then the matter in our universe that is conjectured to have been created by colliding branes would not have been able to escape. But most of the matter in our universe is outside of black holes. So, no.

Plus, we know how black holes form, and it's not from colliding branes.

[Andrew D]

Gravity manifests in a stronger way in the center of galaxies because the galaxies formed in the places with higher concentrations of dark matter. Computational models have shown that baryonic matter in galaxies can only form the structures we see if it coalesced over a less evenly distributed dark matter structure.

[Jeff Root]

Less evenly distributed?? Are you sure? It makes sense
except that I wouldn't expect dark matter to be less evenly
distributed than baryonic matter, I'd expect it to be *more*
evenly distributed.

-- Jeff, in Minneapolis

[Cougar]

Less evenly distributed??

It's like a hidden double negative. It means 'clumpier', which makes sense, since the dark matter could coalesce gravitationally sooner than the baryonic matter because it is non-interactive and unaffected by the fact that all the baryons were in thermal equilibrium, making them unable to coalesce gravitationally.

[Andrew D]

It's like a hidden double negative. It means 'clumpier', which makes sense, since the dark matter could coalesce gravitationally sooner than the baryonic matter because it is non-interactive and unaffected by the fact that all the baryons were in thermal equilibrium, making them unable to coalesce gravitationally.

Exactly.