From: robk@robpc4.robk-home.org   
      
   Tom Roberts  wrote:   
   >   
   > In GR, proper acceleration is physical, while coordinate acceleration   
   > can be merely an artifact of the coordinates used (as happens here for   
   > Luigi's choice [#]). Gravitation never generates proper acceleration,   
   > but real forces, such as EM, always do.   
      
   As someone who has never studied GR, this is an eye-opener for me.   
   If gravity is not a real force, is there a need for gravitons?  Perhaps   
   trying to unify gravity with the other three forces in a grand unified   
   theory is a misguided adventure?  I'm asking as someone who is   
   largely ignorant in these fields.   
      
   Cheers,   
   Rob Komar   
      
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