From: mlfasf@comcast.net   
      
   On 6/23/19 10:37 PM, Sylvia Else wrote:   
      
   > Yet if we perform an experiment that doesn't accelerate anything, but   
   > instead transfers clock readings between observers travelling in   
   > different directions, we still get a "twin paradox" style result.   
   >   
   > That rather suggests that the acceleration has no special role here. If   
   > you want a particular twin to go outwards, and then return, then clearly   
   > that twin will need to be accelerated, but that doesn't mean that   
   > acceleration causes the relativistic result.   
   >   
   > Sylvia.   
      
   The so-called "twin paradox without acceleration", AKA "the three person   
   twin paradox", is a red herring, because since none of the three people   
   accelerate, ALL of them can legitimately use the time dilation result   
   for the entire scenario, and thus NO ONE is surprised at all by the   
   outcome at the "reunion" ... at the very beginning of the scenario, EACH   
   of them could easily calculate the "reunion" outcome, and they ALL   
   always agree on that.  Hence, there is NO paradox in the three person   
   scenario to be resolved, and the scenario therefore has nothing to do   
   with resolving the twin "paradox".   
      
   [Moderator's note:  This reply, though quoting only Sylvia Else, seems   
   to be agreeing with her and disagreeing with the original poster, Rock   
   Brentwood, who claims that acceleration is fundamental to the twin   
   paradox.  -P.H.]   
      
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