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Re: Black Hole, minumal size
[Re: Damocles_]
#326603
06/01/10 19:45
06/01/10 19:45
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Joined: Feb 2008
Posts: 3,232 Australia
EvilSOB
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Expert
Joined: Feb 2008
Posts: 3,232
Australia
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The "smallest possible mass" of a black hole depends on your personal definition of what a black-hole IS...
In MY opinion, a super-massive-object is not yet a black-hole UNTIL its gravity reaches the point where light can no longer escape. Then it IS a black-hole.
So with a bit of net-research, surely there is some information somewhere that can give a genuine value to the strength of gravity required to stop light. And from that value it should be possible to calculate how much mass is required to generate that much gravity.
To the best of my knowledge, a neutron star is a super-heavy-object. So dense it can nearly be called a single super-massive-ATOM!! But it will never evolve into a black-hole I believe. Both neutron stars AND black holes are generated at the heart of a super-nova. Supernova's can create neutron stars when they are big enough 'crush' their own cores into a solid mass. But sometimes, if they are big enough, they will create a black-hole instead. I dont know if the reason for one or the other is due to the amount of mass, that gets compacted, or if it is the power of the explosion that makes the difference. I suspect its a combination of both...
So, to my mind, black-holes and neutron stars are related, but only as separate branches on a star's evolution, not one leading to the other.
So I dont think "small black holes" are possible, the definition makes no sense. But the LHA does create small amounts of anti-matter (which has nothing to do with back-holes BTW), and super-dense-particles (call these super-dense-particles "micro black-holes" if you like). The anti-matter rapidly "delf-destruct"s, and is such small amounts it is harmless. And (I believe) the super-dense-particles "evaporate" as they are pulled apart by the gravitational/elelctrical charges of the nearby (and far more numerous) atoms of normal(unmodified) matter.
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp. A8.30.5 Commercial
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Re: Black Hole, minumal size
[Re: Damocles_]
#326616
06/01/10 20:12
06/01/10 20:12
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Joined: Feb 2008
Posts: 3,232 Australia
EvilSOB
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Expert
Joined: Feb 2008
Posts: 3,232
Australia
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Eh? Gravitation HAS been explained. Gravitation is not a force as such, it is the "shape" of space-time... Mass bends space, not gravity, gravity is the 'shape' of the bend that mass has created. You know, ye-old rubber-sheet example and all that...
And black-holes have(apparently) been observed, kindof. As matter falling in is torn asunder, just BEFORE the event horizon, it generates huge amounts of x-ray radiation. Some of this radiation manages to stay in orbit outside the event-horizon long enough to get thrown off the north and south 'poles' of a spinning black-hole. These x-ray "fountains" have been obverved many times... Not really 'proof', but its the best we can get without visiting one, or making our own...
"There is no fate but what WE make." - CEO Cyberdyne Systems Corp. A8.30.5 Commercial
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