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Can a black hole shrink another black hole's event horizon?

  1. Feb 15, 2016 #1
    http://cdn4.sci-news.com/images/2016/02/image_3628-Gravitational-Waves.jpg [Broken]
    In the above image, i can see that the event horizon of each blackhole has decreased in size. Does that mean that the event horizon can shrink in the presence of another blackhole?
     
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Feb 15, 2016 #2

    Borg

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    How are you concluding that they have decreased in size from a single image?
     
  4. Feb 15, 2016 #3
    Its a screenshot of this video:
     
  5. Feb 15, 2016 #4

    Borg

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    The event horizons are not perfectly spherical due to gravitational effects from each other but they're not decreasing in size.
     
  6. Feb 15, 2016 #5
    But as the two blackholes come closer, don't their event horizons change shape and size, and perhaps shrink at some radial positions?
    And if coming closer increases event horizon size(for all radial positions), wouldn't going away decrease the event horizon size?
     
  7. Feb 15, 2016 #6

    mfb

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    The event horizons do not get smaller. Their images, distorted by the heavily curved spacetime, can appear smaller. I'm not even sure if that happens here. Would probably need some measurement of pixel diameters.
     
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