by 
Farino
ANSWERS: 3
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A graviton (if such exist) is its own anti-particle, just as an antiphoton is the same as a photon. Gravity, therefore, is an exclusively attractive force. At least when we're talking about graviton interaction and not something more exotic like Dark Energy.
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it is unknown, but throught theories and minimal tests it is the only conclusion, that fits the data and is logical.
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1) Yes, according to the theory exposed in this reference: http://www.mrelativity.net/Papers/26/THE_GRAVITON_EXPLAINED.pdf 2) Further information: Here a highly speculative theory about anti-gravitons: "It could be stated that gravitons are the fundamental construct of space-time, and anti-graviton holes are a lack of space-time. Anti-graviton holes seem to exist as a by-product of matter, or more precisely as a by-product of quantum fluctuation. Anti-gravitons may actually lie in another dimension but their effects are felt in this dimension as gravity." Source and further information: http://www.unexplainable.net/artman/publish/article_1143.shtml Here a forum about his issue: http://www.physicsforums.com/showthread.php?t=75329 Here the Wikipedia article about the *hypothetical* particle graviton: http://en.wikipedia.org/wiki/Graviton
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