Antimatter Blackhole: What Would Happen?

[IMP]

I know that we can only create small amounts of antimatter. But, suppose that we could create lots and lots of antimatter and we kept sending it into space to some empty place far away from our solar system. We keep sending antimatter to the same spot until the mass is enough for it to collapse into a black hole. So now we have an antimatter black hole. What would happen if this antimatter black hole merged with a regular black hole? Would they just merge or would they annihilate each other?

 

[wysard]

And when? Assuming you chuck two black holes together, on chocolate and one vanilla, remember they are just points in space. It is not inconcievable that if they came together on an intercept, but not head on collision where the distance between central points was less than the Schwartzchild radius of their combined masses they could co-rotate inside the larger black hole in some cosmic death spiral for some time before actually making contact. Perhaps millenia. We are talking about intersecting two theoretical points in space here.

So assume they meet at some point. (Not something I'm convinced can happen in any other than a theoretical sense) As they eat each other they release energy, most of which is retained inside the field but some of which leaks out.

The question I can't answer is "Is energy density in a volume equivalent to mass in the same volume?" If it is, then your matter/antimatter hole just converts to an energy black hole. If the answer is no, then as the energy goes up and the mass comes down the size of the hole dwindles and the energy escaping goes up to the point where as Hawking pointed out, small black holes explode releasing all their pent up mass as energy.

 

[LURCH]

Anihilation takes time (not much time, but lore than zero). If singularities exist at all, they can't anihilate with one another. But if they could, none of the energy produced could escape, so mass inside the Event Horizon would remain unchanged. So the situation would be the same as two BH's made of ordinary matter merged.