« on: 17/07/2022 18:23:47 »
If you have overlapping event horizons, how would anything "know" which hole to fall into?
It wouldn't fall towards either singularity, but it would be inside the event horizon of both. The question here is whether the two singularities have to merge or if they can move further apart and decouple their event horizons. Here's the thing - I've been imagining tiny manufactured black holes which can be guided by moving masses near them while those masses can be held apart such that their locations can be controlled at all times with precision. We may be able to use these extra masses to prevent the black holes from being diverted off straight paths as they pass each other or at least reduce the bending of their paths enough to prevent their merger. If they fail to merge after their event horizons have connected up, those event horizons can disconnect and the photon can escape.
(Clearly those masses would be much bigger than the black holes and couldn't be moved fast enough to provide the necessary control, but I'm also imagining long chains of black holes in between the end masses with the two chains of black holes meeting at close to the speed of light in opposite directions such that each black hole in the central region of each chain always has an approximately equal pull on it from either side. Have all possible scenarios of this kind been checked carefully enough to be sure that event horizons touching always lead to their singularities merging?)
The reason I want to check whether this might or might not be possible is that it would potentially enable a difference between theories to be tested by experiment. The fuzzballs of string theory (which are like the black holes in LET) are full of stuff all the way through from the event horizon at one side to the event horizon at the opposite side of the black hole, whereas in GTR there is nothing physically there because the material continues to fall on down to the singularity. If you smash the edges of two black holes together, you don't normally get the chance to see if they are made of lots of stuff or consist of nothing because no evidence ever escapes to tell you, but if the black holes fail to merge, you could then access that evidence from a safe distance.