Why do artificial black holes evaporate instantly unlike stellar black holes?

[Jake]

Supposedly, when we can create our own mini-black holes in particle accellerators, they will "evaporate instantly". But a few questions arise with this:

A.) Why is this so (they evaporate, unlike real black holes) and

B.) Are we absolutly certain this is the case? What if it isn't?

Thanks.

 

[Gara]

What is a mini black hole, and how much smaller is it to a normal one?

And as to what happens, it depends on how much mass there is.

 

[lordinfamous]

A.) Why is this so (they evaporate, unlike real black holes) and

Real Black Holes as you put it, don't last forever. They too can and will as you say, evaporate.

 

[Chronos]

Mini black holes are still a theoretical novelty. Theoretically, it is fairly certain they can be as small as a Planck mass. If, however, that is as small as they can be, we will never see one. The energy required is far beyond any currently known technology. On the other hand if less mass is necessary, as predicted by some higher dimensional theories, the Large Hadron Collider [scheduled to go online in a few years] will be able to manufacture them.

All black holes, according to theory, emit Hawking radiation. And that theory is on pretty sound footing. This causes them to lose mass [an energy conservation thing] and eventually evaporate. The rate of evaporation is inversely and exponentially proportionate to their mass. For your typical, stellar size black hole the evaporation process takes eons... pretty much eternity, actually. On the other hand, the pathetic little runts we could manufacture in a collider would last not quite as long as a snowflake in hades.

 

[Mk]

Wikipedia has some information on mini-black holes
http://en.wikipedia.org/wiki/Micro_black_hole

lol, a snowflake in Hades...

 

[Loren Booda]

There may be stable miniature black holes, called "geons" (from John Archibald Wheeler), whose gravitation is balanced by an "equivalent" charge.