Physicists predict that the LHC may create exotic particles like mini-black holes and supersymmetric particlesErrrr.... is this wise????
Is this what you mean?
There has been concern for years that particle colliders might create mini black holes. However, the energy required seemed impossible. Recent developments in string theory have removed the aura of impossibility. Some string theorists now predict that upcoming colliders will be "black hole factories". (Google that quote.) These theorists expect mini black holes to evaporate via Hawking radiation. But Hawking radiation has not been demonstrated experimentally. Five physicists recently estimated the probability that Hawking radiation would work as expected at 50%, 70%, 98%. 99%, and 100%, an average of 83.4%. Another supposed reason not to worry is that cosmic rays in the energy range of upcoming colliders have been hitting the earth (and the moon, where they are more likely to hit heavy atoms) for billions of years without adverse effect. But there is reason to think that a mini black hole would be about as reactive as a neutrino. A mini black hole created by a cosmic ray would retain the momentum of the cosmic ray, distributed over the cosmic ray particle and the earth particle it impacted. It would be moving faster than escape velocity from earth. It would have to accrete many particles to slow below escape velocity, impossibly far out on the Poisson distribution in one pass through earth at neutrino-like rates of impact. On the other hand, a mini black hole created by two particles moving in opposite directions would (sometimes) be moving at less than escape velocity from earth. Depending on its momentum, it would orbit or oscillate within the earth. It would accrete matter at a rate that would be slow initially, but that would increase exponentially.
Why is this not dangerous?
Because it will be done in France. After it sucks in the first frenchmen, the energy of vomitting them back out will propel the mini-blackhole out of the solar system.