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Possible Duplicate:
Why is gravitation force always attractive?

I have heard that the attractiveness of gravitation is due to the fact that it is a spin 2 gauge theory. Why is this so? I find this very interesting and would love to understand this fact.

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resgh
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  • The duplicate link I posted contains a link to quite a detailed article on the subject. I can't say how good the article is because I understood not a word of it :-) – John Rennie Dec 07 '12 at 10:06
  • @JohnRennie I see a problem with the answer given there: the charge of gravitation is not a scalar, but the energy momentum tensor. – resgh Dec 07 '12 at 11:31
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    Tony Zee gives a nice plausibility argument for this based on the form of the spin 2 propagator, and contrasts this with the spin 1 propagator which results in a repulsive force (if the charges are like) – twistor59 Dec 07 '12 at 19:55

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