Quote:
Originally Posted by m1omg
So when do these small black holes form?
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Are you talking about particle collisions [something a la LHC]? Case yes, if the energy density is enough the spacetime will be curved and a [short-lived] black hole will form.
Now, the relativistic mass of a moving particle/object is a measurement effect - observer dependent. It does not 'add' mass to a particle in its own frame.