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Let's consider in this hypothesis that the two black holes have similar masses and approximation speed 0,99 c.

At the maximum approximation point, only their event horizons are invaded slightly. The singularities don't participate in the collision.

I wold like to know:

Can these black holes escape the merger?

If it is possible to escape, can one black hole "steal" internal content from another?

Qmechanic
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João Bosco
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  • "At the maximum approximation point, only their event horizons are invaded slightly" Do you mean that the event horizons overlap? – PM 2Ring Aug 03 '19 at 00:06
  • @PM2Ring - Yes! Sorry, my poor english. – João Bosco Aug 03 '19 at 00:11
  • No, they can't escape. This question was asked recently on the Astronomy stack: https://astronomy.stackexchange.com/q/32410/16685 – PM 2Ring Aug 03 '19 at 00:19
  • Here's a related question on this site: https://physics.stackexchange.com/q/18769/ – PM 2Ring Aug 03 '19 at 00:21
  • @PM2Ring - Exactly, here; astronomy.stackexchange.com/q/32410/16685 is written in detail all the content of my question, Thanks! – João Bosco Aug 03 '19 at 00:46
  • Once the event horizons merge that is it, they are fused. If you were following these black holes and entered before or at the merger both would present apparent horizons that would transition into a single apparent horizon. If you remain outside, the smart choice, the region the merger occurs would have lots of evolving curvature just before the merger. The two black holes would then settle down in a time period about the time it takes light to cross the distance defined by the horizon radius of the fused black hole.. – Lawrence B. Crowell Aug 03 '19 at 01:36
  • @LawrenceB.Crowell - I thought that high speed could avoid the merger. – João Bosco Aug 03 '19 at 02:06
  • A follow-on question: would "avoiding the merger" violate the 2nd Law of Thermodynamics? – JEB Aug 03 '19 at 02:33
  • @ safespeed: This is the horizon distance in flat spacetime, not the tortoise or delay coordinate distance or proper time. – Lawrence B. Crowell Aug 03 '19 at 10:21

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