In reply, I would speculate that there must be a practical limit beyond which matter will no longer 'allow' its density to increase. How that may be enforced, and at what magnitude, is both a significant mathematical exercise and an expensive experiment.
It seems to me that there are 2 important questions here that I have either failed to grasp the explanations for (probable), or have not been addressed in what I have read so far. In SM Black holes we can infer mass from their gravitational effect on stars near the galactic cores that harbour these objects. SMBH's that are not in a feeding phase emit almost no energy because, it's said, that the gravity well is simply too great to allow any to escape. I am no mathematician, hell I never even sat any exam in high school, but it seems to the pea between my ears that there is no loss of mass/gravity from the dormant objects is suggesting that there is no gateway within to another dimension. This is why I loved WHKeiths and your presentation that the 'other side' is a complete universe and that ours too is the hyper-inards of one in a yet bigger universe. This would explain the gravity/mass stability we see. And in a feeding SMBH all the turmoil we see takes place at the event horizon and has no effect on the super dense inner core hence the inner-verse remains stable and unaffected.
The other question is the pressure deep within such objects, unless I am gravely mistaken, does not create heat but acts to supercool. (heat being a product of friction/movement which is denied at such extreme pressures. I believe this is called the Hawking temperature). It seems to me that such an effect would create a Boes-Einstien Condensate which has an uncanny similarity to the Zero Point Quantum Matrix that some theorists suggest to be the canvas on which our universe is painted. Do you see what I'm getting at? Both ideas seem to be in harmony. Further I would conjecture that such ideas intuitively to me suggest that the same laws are present in all universes but raised to a power in accord to the total mass.
Q: Is such a single black hole/universe a hypersphere? What I see is a Mandelbrot set type infinity.
My M-theory understanding is quite limited, but it may be that the supreme flexibility of its equations could be employed to describe the details of reality around black holes. May I ask you to further explain the interactions you mention?
-djm[/quote]
Here I am not sure how to fit it into the above picture. Indeed I think if Brane theory were true we would see a loss of mass/gravity from black holes. An analogy of brane theory as I understand it goes thus:
A tent covered in morning dew. The dew, matter, exists on the outer fly sheet but as it forms a pool on the incorrectly erected tent, it causes a gravity well that makes the fly sheet, brane, contact the inner skin, 2nd brane. At this point of contact the water, matter, can move from one brane to another.
Hope I have made sense
regards
Tao