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Old Apr 18th 2014, 02:47 PM   #1
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How do gravitons escape a black hole?

How does gravity escape a black hole? If even light, which is massless, can't escape once its gone beyond the event horizon then how is it that gravitons can "claw" their way out past the event horizon?
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Old Apr 18th 2014, 05:05 PM   #2
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Originally Posted by kiwiheretic View Post
How does gravity escape a black hole? If even light, which is massless, can't escape once its gone beyond the event horizon then how is it that gravitons can "claw" their way out past the event horizon?
The answer to your question is quite simple: The black hole does not actually emit gravitons. The larger the curvature of space-time the more gravitons are emitted. Space-time is seriously curved near a black hole so the region near a black hole is a rich source of gravitational radiation.

You might find Hawking radiation to be an interesting topic as well.

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Old Apr 19th 2014, 05:41 AM   #3
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The theory of quantum gravitation is not very complete, so this really is a bit of a mystery. Remember that gravitons have not been proved to exist, so any discussion about how they work is a bit of speculation. However, gravitons are considered to be "virtual" particles, much like the photons that mediate electromagnetic attraction. When a two charged particles interact the force between them is said to be mediated by photon exchanges, but these aren't really the same photons that we think of for light - they zip in and out of existence to explain the force between the two particles, and in fact can go faster than light, so long as their behavior doesn't violate the Heisenberg Uncertainty Principle. A black hole can have an electric charge, and hence can attract or repel charged particles in their vicinity, even though the escape velocity of the black hole is greater than the speed of light and "normal" photons. So by analogy it may be that gravitons can also escape the gravity of a black hole. My guess is that if or when gravitons are actually proved to exist we'll have a much better answer to questions like this.
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Old Jun 21st 2014, 11:53 PM   #4
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Originally Posted by kiwiheretic View Post
How does gravity escape a black hole? If even light, which is massless, can't escape once its gone beyond the event horizon then how is it that gravitons can "claw" their way out past the event horizon?
See http://math.ucr.edu/home/baez/physic...k_gravity.html
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