The electromagnetic force is modeled as being transferred by virtual photons. These are messenger particles which must be able to create a force at a distance of either attraction or repulsion.  Gluons and gravitons only create attraction.  The obvious question is: How do these messenger particles create attraction? In any exchange of real particles, only repulsion is achieved. Also, the messenger particles must create a specific amount of force for a given set of conditions. The Coulomb force scales with the constant 1/4πεo and the gravitational force scales with the gravitational constant G.  Both εo and G are properties of spacetime.  Do messenger particles scale with the properties of spacetime? 

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