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As you point out, gravity is unique among the forces as being something intimately related to the curvature of space-time.

This makes it a non-trivial problem to come up with a theory of gravitons.

Quote from: JPAs you point out, gravity is unique among the forces as being something intimately related to the curvature of space-time.So how is this different from the electrostatic field? The electrostatic field E is defined by how test particle having charge q behaves when placed in the field. In classical electrostaticsE = F_{elec}/qIn classical gravity we have the same thing, i.e. the gravitational field G is defined by how it acts on a test mass mG = F_{grav}/mIn general relativity its similar. For the exact expression please see Eq. ( at ...sorry, you cannot view external links. To see them, please REGISTER or LOGINSo just as the electrostatic force is mediated by photons so to do they expect the gravitational force be mediated by gravitons.Quote from: JPThis makes it a non-trivial problem to come up with a theory of gravitons. I don't follow. Please explain.

Quote from: JPAs you point out, gravity is unique among the forces as being something intimately related to the curvature of space-time.So how is this different from the electrostatic field?

As Pete has pointed out the equations for gravitation and electromagnetism are very similar.

Also curvature, as Pete points out need not be present for gravity.

If people took the trouble to look at some of Pete's pages then a lot more understanding would be gained all round.

Nice answer JP. As for the question of gravitons, if they exist then gravity would be a force, is that not so?