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About gravitons, I haven't understood how objects theorized from the quantization of gravitational field, could match with the fact that, in GR...the gravitational field doesn't exist at all! 
Alberto - although the gravitational field is not explicit in GR, it is not precluded. GR says that matter warps spacetime and spacetime tells matter how to move. It does not say how matter warps spacetime. That is where gravitons and the gravitational field could come into it.
That is indeed what I mean. Can you think of a reason it could not be correct?
Quote from: DoctorBeaver on 05/11/2008 18:50:03That is indeed what I mean. Can you think of a reason it could not be correct?The fact is that I don't know anything about gravitons and how they operate inside the theories that contemplate them.
yor_on - Thank you. I am familiar with what you said in the 1st 2 paragraphs.I am intrigued, though, as to why the event horizon is meaningless to a virtual particle. Or do you just mean a massless virtual particle?
Whereas in string theory you've got 5 jigsaws all mixed up together in same box 
lightarrow:)would you like to explain that one further.It sounds intriguing and it's new to me.As i understand it it has to do with virtual particles only existing for such a short moment that they, even though interacting with our spacetime, won't be touched by Heisenberg's uncertainty principe. That allows them all kind of strange things, amongst them traveling faster than light according to Nasa.