Black holes radiating themselves out, going boom. Is it probable that the resulting boom produces (even if for only a few milliseconds) a white hole that would expel the entire contents of whatever aforementioned black hole consumed during its life?

IIRC, by the time the black hople explodes, it's already radiated away most of whats in it. But there would still be something, even if just energy

I still wouldn't want to be to close to one...but watching from a safe distance would be really cool!

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441!!!! :)

I'm not really sure on the theory of this one, but the deal with black holes is that they gradually reduce in size due to the Hawking radiation process. When it eventually evaporates, it releases a large amount of energy. Now whether or not this energy could go in reverse through a white hole, I don't know. Would be interesting to look into though.

And this process by no means is explosive. The hawking radiation is about occasional negative particles (generated as positive-negative pairs by zero-point energy fluctuations close to the BH), falling into the BH. The positive pair is released and makes its way into the universe, being detected as if it originated from the BH. Such emission is very rare, and it takes zillions of years to exhaust a BH.

It´s been a long time sice I last heard someone talking seriously about white holes.

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I'm not sure how much (or even if) the Hawking process has been verified experimentally yet, but it certainly is true that the dissipation of a BH isn't necessarily explosive.

However, since the temperature of the black hole (and hence the amount of energy it puts out) varies as the inverse of its mass, as the mass shrinks to zero, the radiation increases, eventually having a huge spike just at the very end. Look on the last page here for a graph that shows this. So there is a final burst of high energy radiation for a black hole as it evaporates, even if a large back hole may take a very long time to reach that last bit.

Time yet for one more thought.

Every year, approximately one hundred particles collide with the upper atmosphere with energy enough to create minute black holes. These tiny BH evanesce right after, into a shower of particles: the Hawking radiation.

Researchers at CERN will try to detect the hawking radiation, observing the decay of tiny black holes at the Large Hadron Collider, by 2007. I think we´ll have a final answer on what happens in the final moments of a black hole´s life then.

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That ought to be interesting. Too bad we have to wait a couple years. Lousy time....

You mean, like if Homer Simpson had fallen in, the boom would shoot him back out?

We probably shouldn't expect him to be in any recognizable shape though. For instance, logs go into a fire, and come back out in the form of heat, smoke, and ash. Rarely as logs.

Er, uh, interesting analogy, I must say.... lol.

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Is this theoretical, or have these particle showers actually been observed? I was under the impression that the idea that particle collisions could create mini-black holes was still speculative.

It´s an estimate. To my best kwnowledge such balckhole forming collisions haven´t been observed so far. The work of Helio Rocha-Pinto of the Astronomy and Geophysics Institute of the Sao Paulo State University, Brazil, informs my post.

Edited:

The experiments at CERN are expected to find material evidence of the phenomenon.

The following article, though not directly related to this subject, can give a glue on the amount of energy needed for collisions of that kind.

http://216.239.41.104/search?q=cache...t&ie=UTF-8

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What brings us together is stronger than what pulls us apart