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Re: Radiation Emission From Black Holes?

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Posted by Thed/">Thed on May 22, 1998 09:22:31 UTC

: According to Stephen Hawking, if two particles directly on the event horizon collide and one of the particles is bounced away, it can escape. : Source:

: Anyway, I'm wondering how these two particles can be created out of nothing?

It is an effect called Heisenbersgs uncertainty principle and is results from Quantum Mechanics. In short waves and particles are interchangeable, at a small a scale. So to model how an electron or photon behaves we assume that it is a probability wave. From this we find that a particle or wave has a certain probabiliy of existing or not existing at a point as it moves. This introduces the concept of uncertainty. You find that a there is an inherent uncertainty in where a particle actually exists.

What Heisenbergs Uncertainty principle says is that the uncertainty in momentum of a particle times its uncertainty in position is equal to or greater than a constant. This means that if you could measure the particles position exactly you would know nothing about its momentum and vice versa. The same idea extends to energy and time. what this allows is that a quantity of energy can be created from nothing providing it does so for a time less than this constant, about 10^ -33 seconds, the so called planck time. This energy is manifested as virtual particles and they are used to explain how atomic forces are transmitted in and between atoms. We can ever detect a virtual particle but they could be manifested as mass loss of a black hole as above.

: One more question: : It is theorized that if enough energy escapes, the mass of the black hole will become small enough that the black hole will not be able to completely curve the space around it and it will explode with a power greater than millions of atomic bombs. How can a black hole explode?

As the article says the hole loses mass with time. A black hole is only a black hole because the escape velocity is greater than the speed of light. The escape velocity of an object is GM/R^2, the only variable is M. If M is reduced the escape velocity becomes lower than the speed of light. Assuming that the mass of the hole is not a singularity the forces at the center will be strong enough to cause the mass to explode. To be honest I do not know how this works either, this is just a guess.


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