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No Earth-imploding black holes at LHC this decade. Probably.

While (some of) the world watched the Large Hadron Collider power up, fault, power up again and ultimately land its first 7 TeV collisions, others may have gripped their armchairs tightly, waiting for the planet-destroying black hole that some claim the LHC is capable of creating. As one might be inclined to notice, the Earth has made it through the ordeal just fine.

However, whether these doomsday black hole concerns are credible or not, a pair of scientists from Princeton University and the University of British Columbia at Vancouver have been delving into the relativistic physics calculations just to see what might really happen. Matthew Choptuik from UBCV and Frans Pretorius from Princeton have done the grunt work to solve field equations related to soliton collisions at specific energies.

"Our calculation produced results that most were expecting, but no one had done the calculation before. People were just sort of assuming that it would work out. Now that these simulations have been done, some scientists will have a better idea of what to look for in terms of trying to see if black holes are formed in LHC collisions," explained Choptuik.

Based on string theory and its extra dimensions, Choptuik and Pretorious concluded that high-energy collisions at the LHC could indeed form black holes -- but the chances of them destroying the world are pale even in comparison to the chance that they would actually be detected by LHC equipment while they exist.

Of the events, Choptuik says, "Some are already taking this very seriously. However, I don’t think that we are likely to actually see any black holes at the LHC, even if it is possible."

Rather than directly observing such a formation, he explains that to confirm the existence of the fleeting matter-energy magnet, LHC scientists will have to study the debris from the collision rather than the particles that instantaneously exist and then disappear. A typical collision would leave jets of debris while the short-lived black hole would produce a more spherical pattern.

The duo's findings have been published in the journal 
Physical Review Letters, titled "Ultrarelativistic Particle Collisions."



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RE: Black Holes
By SPOOFE on 4/7/2010 4:56:17 PM , Rating: 2
quote:
The matter doesn't "go" anywhere. It is destroyed ;utterly and broken down to it's most basic energy form.

E=MC^2. Matter is not "destroyed", it is converted to energy, and the two, for the sake of this discussion, are the same. The mass/energy, and thus the gravitational attraction of the BH, are increased, and as a result its apparent event horizon becomes larger.

quote:
This is why black holes emit massive amounts of x-ray's and other forms of radiation.

As matter falls into a black hole, it accelerates and becomes energetic; if a large amount of matter is falling in at the same time, it can become energetic and dense enough to cause the X-ray emissions we witness. No actual energy is radiated from within the bounds of the event horizon.

quote:
Except energy like radiation is NOT effected by gravity

Incorrect.

quote:
If all the energy was trapped and "adding to it's might" as you put it, we wouldn't be able to observe these energies from Earth or space satellites, which we clearly CAN and DO.

We witness the results of material interactions just prior to crossing the event horizon. The tidal stresses just outside the EH are still extreme, even if they don't trap light particles, and those tidal stresses produce some very intense and energetic reactions.

quote:
Think about it this way, some of these black holes are as old as the universe itself. If you were correct, and Black Holes fed and grew larger, than there might not be much of a universe left to observe would there ?

Nonsense. Most celestial bodies are separated by a gigantic void. Void provides no material for a black hole to feed on. It is true that some distant future of the universe is likely to be dominated by super-massive black holes, but at this point in the universe's expansion, there's no reason to believe that BH's wouldn't be anything other than an isolated phenomenon.


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