Can a black hole event horizon be pulled out of round?

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Offline Eric A. Taylor

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Black holes sometimes merge with each other. Just before they merge are the event horizons pulled out of round making the black hole egg shaped. If the two event horizons begin to touch will the black holes become hour glass shaped?

What about merging neutron stars.
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Offline Mr. Scientist

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Can a black hole event horizon be pulled out of round?
« Reply #1 on: 06/12/2009 19:33:23 »
Black holes sometimes merge with each other. Just before they merge are the event horizons pulled out of round making the black hole egg shaped. If the two event horizons begin to touch will the black holes become hour glass shaped?

What about merging neutron stars.

It would be stretched from one end to another until one of the ends meet. If they rotate, they might form a swirling effect, before shattering the spacetime fabric and releasing all those gravitational waves. :)
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Offline Mr. Scientist

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Can a black hole event horizon be pulled out of round?
« Reply #2 on: 06/12/2009 19:34:38 »
And i'm not sure about neutron stars. They may just collide and release massive amounts of energy, rather than completely merging.
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Offline LeeE

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Can a black hole event horizon be pulled out of round?
« Reply #3 on: 07/12/2009 01:47:58 »
The Event Horizon marks the point where the gravitational gradient reaches a certain point, so yes, the shape need not be spherical.

There is no problem with neutron stars merging, as long as they're both matter (or anti-matter); they're just made out of neutronium.  Neutron stars are not dense enough, and merging doesn't increase their density enough either, to form an Event Horizon i.e. the gravitational gradient they produce isn't steep enough.
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