On Thursday, March 19, 2020 at 11:53:17 AM UTC-5, ben...@hotmail.com wrote:   
   > On Sunday, March 15, 2020 at 3:13:52 PM UTC, Jos Bergervoet wrote:   
   > > On 20/03/15 12:18 PM, ben6993 wrote:   
   >...   
   >...Unless .... and this is anathema to all bona fide=20   
   > physicists, but I am currently wondering if time for an antiparticle is   
   > travelling backwards, as nominally shown in a Feynmann diagram.  So a Bell   
   > test starts at say Alice's measurement and ends at Bob's measurement.  Or   
   > vice versa.  ...   
      
   This would not be relativisticly consistent.  That is, if we are to say   
   that \the causal chain starts with Alice's measurement which eventually   
   causes Bob's, then to be consistent with the relativity principle there   
   must not be any observer who sees Bob's measurement happening first,   
   thus "causing" Alice's result.  It has been demonstrated that entangled   
   correlation does occur between two spatially separated events (i.e.   
   Alice's and Bob's measurements) and so there would be observers who can   
   see either Alice's or Bob's measurement happening first.  If causality   
   is to have meaning we can't accept this.   
      
   If you only allow forward causality (i.e. the result of a measurement   
   only depends on events within its past light cone), then the moment of   
   emission of the entangled particles is the only time common to both   
   Alice and Bob. This requires hidden variables (as you are trying to make   
   sense of).  The Bell Inequality applied to such experiments, however,   
   proves that the results of the measurements at Alice and Bob cannot be   
   solely determined by a local hidden variable on the particle.  The   
   statistics are wrong and the inequality is violated.   
      
   The solution I subscribe to is retro causality.  That is, the particle   
   is not emitted until its destination is determined and is consistent   
   with the constraints of polarization/spin/etc.  This requires some sort   
   of communication cannot be used to communicate information beyond the   
   fact that out there, from the future, hence the term "retro causality".   
   This  communication somewhere, is something that can accept the   
   photon/particle w/spin.   
      
   This is a somewhat controversial idea.  I'm not sure how many mainstream   
   physicists subscribe to this, but it is discussed by serious physicists.   
      
   BTW, I too abhor the idea of the multiverse.  The number of entire   
   universes spawned every instant is unimaginable, and I think fails the   
   Occam's Razor test.   
      
   Rich L.   
      
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