Can antimatter black holes exist?

In the  Grand Unification epoch
(up to 10^{-36} seconds after the Big Bang) matter and antimatter were pretty thoroughly mixed up, so the chances of isolating enough of either to form a black hole (not to mention cooling it enough to collapse) were nil.  As things thinned out and cooled off towards the end of the GUT Epoch, it is thought that some rather delicate imbalances in fundamental interactions led to what we call matter having a slightly higher probability of drifting away on its own than what we call antimatter; thus when the strong & electroweak interactions "froze out" as stable particles, there was a tiny residue of matter left over.  That's us.  
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This scenario would seem (to me) to preclude the accumulation of large, isolated clumps of antimatter by any "natural" process.  

Of course, magic (a.k.a. "a sufficiantly advanced technology" by Clarke's Third Law 
might create such a thing "artificially".  It would be a pretty evil thing to build, since dropping one into a galaxy's central Supper Massive Black holes might sterilize that galaxy and quite a few of its neighbors.  So let's hope no one does.  

Then again, if nothing can escape from a black hole, maybe all that fury released as matter and antimatter annihilated "inside" one would just stay in there and have no effect on the "outside".  In that case those SMBHs would make great disposal units for all sorts of really nasty weapons....

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