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Pardon the oversimplified explanation of quantum mechanics.
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From http://www.lhcconcerns.com/ ..
In theory (according to Hawking Radiation) any Black Hole created would evaporate in Femtoseconds, not having the chance to accrete any mass, and being essentially harmless, although this is comforting in theory, It has never been proven, and in fact has been questioned before. The problem is that although most people in the physics community believe in Hawkings Radiation, it has no basis in observation. In 2003 Adam D. Helfer Published a paper concerning Hawking's Radiation coming to the conclusion that Hawking's Radiation may in fact be incorrect, and that a Black Hole would not lose mass in such a way. (For the full text of this document go here Paper By Adam D. Helfer on Hawking Radiation.)
http://arxiv.org/PS_cache/gr-qc/pdf/0503/0503052v1.pdf
It might be the case that black holes don't really exist. That would solve the conundrum of how the big bang could ever have happened without forming an event horizon and collapsing back in on itself.
http://space.newscientist.com/article/dn12089-do-black-holes-really-exist.html
It may remain slightly less dense than what is necessary to form an event horizon, by some quantum mechanical mechanism, but still cause enough gravitational redshift of outgoing light to render it almost undetectable.