CERN LHC = danger?

Here I quote the definition from Wikipedia, the free encyclopedia:

'Simulated view of a black hole in front of the Milky Way. The hole has 10 solar masses and is viewed from a distance of 600 km. An acceleration of about 400 million g is necessary to sustain this distance constantly.

A black hole is a region of space in which the gravitational field is so powerful that nothing can escape after having fallen past the event horizon. The name comes from the fact that even electromagnetic radiation (e.g. light) is unable to escape, rendering the interior invisible. However, black holes can be detected if they interact with matter outside the event horizon, for example by drawing in gas from an orbiting star. The gas spirals inward, heating up to very high temperatures and emitting large amounts of radiation in the process.[2][3][4]

While the idea of an object with gravity strong enough to prevent light from escaping was proposed in the 18th century,[5] black holes, as currently understood, are described by Einstein's theory of general relativity, which was developed in 1916. This theory predicts that when a large enough amount of mass is present within a sufficiently small region of space, all paths through space are warped inwards towards the center of the volume, leaving all matter and radiation with nowhere else to go.

While general relativity describes a black hole as a region of empty space with a pointlike singularity at the center and an event horizon at the outer edge, the description changes when the effects of quantum mechanics are taken into account. Research on this subject indicates that, rather than holding captured matter forever, black holes may slowly leak a form of thermal energy called Hawking radiation.[6][7][8] However, the final, correct description of black holes, requiring a theory of quantum gravity, is unknown.

Sizes of black holes

Black holes can have any mass. Since the gravitational force of a body on itself, at the surface of a body of any shape, increases in inverse proportion to its characteristic lengthscale squared (as volume-2/3 ), an object of any shape and mass that is sufficiently compressed will collapse under its own gravity and form a black hole. However, when black holes form naturally, only a few mass ranges are realistic.

Black holes can be divided into several size categories:

* Supermassive black holes that contain hundreds of thousands to billions of times the mass of the sun are believed to exist in the center of most galaxies, including our own Milky Way. They are thought to be responsible for active galactic nuclei.
* Intermediate-mass black holes, whose sizes are measured in thousands of solar masses, may exist. Intermediate-mass black holes have been proposed as a possible power source for ultra-luminous X ray sources.
* Stellar-mass black holes have masses ranging from about 1.5-3.0 solar masses (the Tolman-Oppenheimer-Volkoff limit) to 15 solar masses. These black holes are created by the collapse of individual stars. Stars above about 20 solar masses may collapse to form black holes; the cores of lighter stars form neutron stars or white dwarf stars. In all cases some of the star's material is lost (blown away during the red giant stage for stars that turn into white dwarfs, or lost in a supernova explosion for stars that turn into neutron stars or black holes).
* Micro black holes, which have masses at which the effects of quantum mechanics are expected to become very important. This is usually assumed to be near the Planck mass. Alternatively, the term micro black hole or mini black hole may refer to any black hole with mass much less than that of a star. NASA's GLAST satellite, to be launched in 2008, will search for such primordial black holes as one of its tasks.

What makes it impossible to escape from black holes?

General relativity describes mass as changing the shape of spacetime, and the shape of spacetime as describing how matter moves through space. For objects much less dense than black holes, this results in something similar to Newton's laws of gravity: objects with mass attract each other, but it is possible to calculate an escape velocity which allows two objects to move apart indefinitely. For objects as dense as black holes, this stops being the case: neither light nor even the most powerful spaceship with an unlimited fuel supply can escape once they get within a certain range, because the energy required to leave the hole becomes infinite.

There are several valid ways of describing the situation that makes escape impossible. The difference between these descriptions is in the coordinates they use to measure positions in space and time; the choice of coordinates depends on the choice of observation point and on additional definitions used. The cause of these complications is that, at moderately close ranges, the black hole distorts spacetime so severely that things look very different from different viewpoints. A rather simple analogy is the way in which images are distorted by lenses; observers on each side of the lens see distorted images of each other.

Event horizon

This is the boundary of the region from which not even light can escape, but at the same time, light does not get sucked into the black hole. Stephen Hawking, in his book A Brief History of Time, describes the event horizon as "the point of which light is just barely able to escape ("I like to think of it as being chased by the police but just barely managing to stay one step away!")." Another way to think of this is that the light is running on a spacetime "treadmill;" the light is moving away from the black hole at the rate of c, but the spacetime is being sucked into the black hole at the same rate, so the two cancel each other out, much like a treadmill. An observer at a safe distance would see a dull black disc if the black hole was in a pure vacuum but in front of a light background, such as a bright nebula. The event horizon is not a solid surface, and does not obstruct or slow down matter or radiation that is traveling towards the region within the event horizon.

Read the full article at:
http://en.wikipedia.org/wiki/Black_hole

I quote the first part of a series of many articles at the 'Unification Theory'. This is complelling/complexm material. Please visit http://www.unificationtheory.com/god/CONCERN.html to read the full series of articles. To read this quote out of context makes less sense.

'It is not science fiction, it will happen at CERN…

In a best-seller called ‘Earth’, 10 years ago, the American science fiction writer, Mr. Brin, considered the hypothesis that a micro black hole entered the Earth and swallowed it up. A team of scientists tried then to save the Earth of a catastrophe that would end all forms of life… Well, that was then, 10 years ago, our literary heroes were the good scientists trying to save the world. Now our mad scientists, the real ones, are trying to create that precise tiny black whole to destroy the world. And they have a big chance.'

And later on:
'Facts are straight forward: In November 2007 the biggest particle collider of the world, the most expensive machine in history, will switch on at Geneva in the border between France and Switzerland. CERN, the Center for European Research in Nuclear Physics has spent 8 billion dollars building a tunnel of 27 kilometers buttressed with superconductive magnets that can accelerate gold atoms to the speed of light. They plan to concentrate all that energy in a micro-point of space-time to collapse and tear off the membrane of electromagnetic energy in which we exist, creating a black hole, in order to learn which of the 3 theories about black holes is more certain: Einstein’s theory, which forecasts the exponential growth of the black hole as it sucks in the electromagnetic world in which we live; cosmological theories that predict a mini-big bang explosion of enormous proportions; or Mr. Hawking’s theory, the only one that has failed all experimental tests, and the only one which predicts the harmless death of the black hole.'

And then:
'Physicists expect however that the black holes they create will be very tiny and explode soon evaporating ‘only’ the mass of 4.000 protons, according to those rather speculative Hawking’s calculations… But it is by no means clear that the black hole will not grow first and explode with a far bigger mass, as it happened in a recent pre-experiment at Brookhaven, where a tightly packed lump of quarks made with an 8th of the energy that will be used in CERN next year - a proto-black hole without enough density to become stable - grew 10 times faster and lived 10 thousand times longer than expected, before exploding into a micro-big bang.'

And later:
'All those experiments prove that the dangers are much higher than those officially given by CERN. And yet that is a relatively ‘positive scenario’ equivalent to the Uranium ‘small’ bomb.'

Source: http://www.unificationtheory.com/god/CONCERN.html
Quote from unification theory