From: mlfasf@comcast.net   
      
   On 3/7/22 2:09 PM, Mike Fontenot wrote:   
      
   > But with a UNIFORM and constant gravitational field (absolutely parallel   
   > field lines, and no variation in field strength), the equivalence   
   > principle says this is equivalent to two test bodies undergoing the same   
   > constant acceleration, with no gravitational field present.   
   >   
   > [[Mod. note --   
   > Note also that in the context of general relativity, one needs to be   
   > careful in invoking the equivalence principle for a *uniform* *constant*   
   > gravitational field.  The problem is that such a field is the result of   
   > (i.e., implies the presence of) an infinite mass plane,   
      
   True,   
      
   >which means that   
   > spacetime is *not* asymptotically flat.  That has a number of "interesting"   
   > consequences...   
   > -- jt]]   
   >   
      
   Can you elaborate on that?  Why does that imply that spacetime "is not   
   asymptotically flat"?  And what exactly does "asymptotically flat" mean?   
      
      Mike Fontenot   
      
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