Onion-shaped black holes

A Vinicio Coletti's idea

First published on February 16, 1999
Updated on September 20, 1999

This text is an intellectual property of Vinicio Coletti, Rome, Italy.
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What we already know

When a star of great mass ends its nuclear fuel, there is no force able to stop the gravitational collapse. Mass reaches high densities and the star becomes a black hole. All mass collapses at the center of the black hole, in a singularity, while around it an events horizon is produced, a virtual sphere marking the borders of the black hole. Matter and energy falling down over the events horizon, can never go back and they reach quickly the singularity.
According to Schwarzchild, the events horizon delimitates a closed region of the space-time, totally inaccessible from the outside. Later, Steven Hawking demonstrated that black holes radiate and can even lose all their mass.

Anyway, matter falling down lose quite all its original features and is reduced to a very elementary state, where the only observable things are mass, magnetic field and angular momentum of the black hole, being thus very similar to an elementary particle. This scheme has some problems however, because the total amount of information in the universe is supposed to be constant and we lose instead quite all the information about the matter falling down into a black hole.

There is another effect of the events horizon, always according to Schwarzchild: what happens to matter is different if observed within the internal reference system of the black hole or from an external reference system, at a distance. Looking from the inside, matter approaches the events horizon, crosses it, then quickly falls towards the singularity. Looking from the outside, matter approaches indefinitely the events horizon, reaching it only at time plus infinity. To solve this problem, theoretical scientists invented schemes to make things appear the same way everywhere and this schemes introduced also the possibility to travel in time and space for matter crossing the events horizon.
But what if nature were exactly this way, with matter (as seen from the outside) accumulating just out the events horizon?

Thus

My idea is the following. Since we are outside black holes we observe, matter does not actually fall inside them, but it only comes very close to the events horizon. Not falling inside, its information remains accessible from our universe. Inside the black hole there is only the matter that was on the star before it collapsed.
This imply that matter becomes more and more dense in a very thin sphere, just outside the events horizon. What will happen when density in that zone will reach that of a black hole? That is when the average density of the black hole up to the events horizon, plus a thin layer outside will be itself sufficient to produce a black hole? I think that a new events horizon would be produced very quickly, with a radius just a bit greater than the former one.
The fast subtraction of a great quantity of mass from our universe would perhaps produce a bright high energy flash (a gamma burst?) or perhaps nothing visible would happen, but black holes would be similar to onions, with many events horizons, one inside the other.
Establishing what would happens to space and time between these layers, it's far beyond my possibilities.

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