Can the existence of gravitons ever be proved? How?
by 
Luc Thiet Thuan
ANSWERS: 2
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Gravitons uniquely for known particles have spin 2. A graviton that was generated in an interaction between particles in a particle accelerator would leave a distinctive signature. Unfortunately gravitons interact so weakly that there is no practical way we could detect them this way. We can only reason about them indirectly, just as Einstein showed that photons must exist before individual photons were detected about 31 years later. Unfortanately Einstein made his predictions from studies of the behaviour of light, and the equivalent for gravity is gravity waves, which have still not been detected. Still we probably will be able to say with certainty that gravitons do or do not exist eventually
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I am betting that gravity (the graviton) is a zero dimensional (ZD) force. I believe the LHC will answer the question. That would indicate a black hole to be considered ZD and also that the universe big banged into existence from a ZD, and not "nothingness".
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