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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 MrBlastman on 4/7/2010 11:26:52 PM , Rating: 2
quote:
As the gas slowly spirals through the accretion disk towards the black hole, it releases a large amount of energy


Thank you for quoting what I said in my previous post--a different way. ;) The accretion disk is NOT the black hole itself, it is swirl of matter that is facing ultimate demise by the black hole, waiting to be gobbled up. Large is only subjective, for that matter (get the pun), as it is just a fraction of the total mass.

The hole ultimately wins gaining the lions share of the mass.

quote:
This phenomenon makes it impossible to determine, as you so surely state, weather or not a Black Hole grows or even what happens inside of it. Or even if there IS an "inside" as we would perceive


Your logic buffer has overflowed finally. ;) Normally it is functioning okay but right now it is not. Why then, if black holes do not grow as you put it, or, better yet, are unable to be determined if they grow (which we have some pretty good theory backing up that they do), are there many different sizes of black holes--and there is a direct relationship between the size of the event horizon (your black hole) and the mass it contains within.

Once mass goes in, the _only_ way we know it can go out, is through Hawking Radiation. Not x-rays. We can detect the x-rays that are potentially released prior to entry, but that is all.

quote:
Light is made up of particles, which cannot escape black holes. Massive bursts of x-ray and other forms of radiation can and DO escape, which is why we can observe this happen.


Light is both a particle _and_ a wave. This packet of energy is commonly referred to as a photon. A photon is electromagnetic radiation. The same electromagnetic radiation that makes up the electromagnetic spectrum. This is the same spectrum that contains radio waves, infrared light, visible light, ultraviolet light, x-rays and gamma rays. The reason we can only see visible light is the wavelength of that wave (or photon, or, as you put it, packet of energy).

As such, no photons, no matter their wavelength, can escape once passing through the event horizon, which, is the black hole itself. Matter that crushes after that point, might be come energy, but it is energy that is stuck.

quote:
Unfortunately, the amount of this radiation to be released is so small, it has never been observed from a black hole in deep space. Again, lie lie LIE.


Here you misunderstood me again. The radiation I speak of in the quote above is Hawking Radiation. If you don't believe me, look it up, it has been documented in many places. I'm not lying here at all. Read up some more on all of it. It is mostly theory, nonetheless, but it is fascinating for sure.


"I modded down, down, down, and the flames went higher." -- Sven Olsen

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