My intuition says pretty much the same thing as Dmitry67's. There has to be a lag.When two black holes collide, do their singularities merge the instant their event horizons touch? Or is there a lag between the event horizons touching and the singularities merging when there are actually two singularities inside a single black hole?
That would be great. If they can point us to a review article on arxiv or something, that would be very cool.This is an interesting question, actually... I think next time I get the chance I'll ask some of the folks at work (who numerically solve the E.Eqns and do these kind of black hole mergers) what happens to the actual singularities during a merger.