Science Forums 2

[Jay-qu]

Originally Posted by Boerseun

...having read my above post, I guess a better question would be what would happen if two black holes fell together, one matter, the other anti-matter, but the difference between the two is still big enough to cause a black hole?

Say the minimum mass for a black hole is x. Say the matter black hole's mass is 4x, and the mass of the anti-matter black hole is x. Would the infalling anti-matter black hole cause any gamma radiation to escape? Keeping in mind that the anti-matter black hole will have to pass well beyond the matter black hole's event horizon before touching any matter, I don't think so... But the event horizon should suddenly and quite dramatically shrink upon annihilation?

Curious...

Very curious...

Well B, have you heard of the saying 'Black holes have no hair'? Black holes are only thought to carry a few basic properties: mass, charge and entropy. From this understanding it seems that the 'information' of the matter being either matter or antimatter is lost. Thus the black holes would simply collide and make an even larger black hole. This is what you may expect to happen, after all a matter/antimatter annihilation produces photons that could not escape from the black hole.