Are gravitons and black holes mutually exclusive concepts?

Question

Black holes are objects so massive, that their escape velocity is the speed of light.

A graviton is a particle of gravity which travels at the speed of light.

So how would a graviton escape a black hole, since it travels below its escape velocity?

But if gravity can't escape the black hole, how would space around the hole get warped? Or would the space surrounding the mass be more of a "black cliff", where anything that crossed the Swartzchild radius would enter, but nothing else would even detect the black hole's presence (except for Hawing raditation)?

Something's not making sense here. Hopefully, it's just me.

Answer 1

I don't know that this is THE answer, but this is one possible answer. It is believed that black holes can create virtual particles, in pairs; just outside the Schwartzchild radius, from which nothing can escape. One particle or photon is swallowed and the other is emitted. That is the source of the Hawking radiation.

I suppose that the black hole could cause pairs of gravitons, and the ones inside are undetectable to us.

I agree that it doesn't make much sense. But then, I suspect that it wasn't intended to.

Answer 2

The thing is that gravitons are a QM explanation (actually an M and string theory but who cares), whereas warped spacetime is a general relativity.

What happens is that under QM the gravitons are simply not affected by gravity - they are configured funny, and as such do not interact with themselves.


In general relativity, the black hole is surrounded by a region of bent spacetime such that there is no path by which light can escape. However, in this, there are no gravitons as it is a different explanation of the world.

Then there is the other explanation, using a 'cosmological constant' - the idea that there is some kind omniscient push by a steady flow of gravitons or any other carrier, and that massive objects interrupt this, thus instead of feeling an equal pushing force from all directions, something then feels a pushing force in all directions but the one where the object is, thus sending it toward it.

However, there are now challenges to the idea that there may be black holes. See especially:

http://www.guardian.co.uk/science/story/0,,1832896,00.html

:)

How do I know this? I asked it before. However, my next question was the harder one:

How, if gravitons and photons move at the speed of light, can a graviton affect a photon? If it started 2 metres behind and travelling in the same direction it would never ever get closer, and so light ought to be able to escape from a black hole.

I am now looking for experts!

Edit: I am not Stephen Hawking, poster above me!
Not that smart!
Great that you knew him at least.
Poor guy, Amyotrophic Lateral Sclerosis SUCKS.

Answer 3

The graviton is still a theoretical particle, and accordingly, nothing is known about its property. If it "carries" gravity, should it have a mass?

It has been suggested that gravity might work like a shadow, i.e. that gravity is some sort of onmidirectional negative pull (therefore a push) which gets interrupted when a large body is close by. If you are in the middle of nowhere, and there is nothing around, you are simply pushed equally from all directions. If there is a large mass close by, you are pushed from all directions except the one where the mass is, so you feel "pulled" in that direction as a result. This hinges with the "cosmic constant" concept that could explain the expansion of the universe, more specifically the inflationary phase.

Answer 4

A black hollow is seen a "dark matter" merchandise. you could't see it in view this is dark; using a telescope to look promptly on the black hollow, whether you knew precisely the place to look, does not enable you to confirm something. watching its consequences is the only thank you to be responsive to that a black hollow exists interior of reach.

Answer 5

oh my god can anyone really answer this?
is stephen hawking on line?