On Saturday, October 13, 2018 at 10:56:46 AM UTC-5, Nicolaas Vroom wrote:   
   > An article with this title is in Nature of 28 September 2018 at page 446.   
   > The first sentence of this article reads:   
   > "New twist on thought experiment yields conflicting results"   
   > The subject of the article is a new version of the Erwin Schrödinger's cat   
   > thought experiment in which the cat is replaced by two human beings   
   > (Alice and Bob) and with two observers. (one for Alice and one for Bob)   
   >   
   > My problem with this thought experiment is how can you claim, based on the   
   > outcome of this thought experiment, anything about the real world.   
      
   I have an even bigger problem with this (or any) version of the thought   
   experiment, which I made clear in the subject header itself.   
      
   In order to have such a setup, you need to have a container that shields   
   what's inside from what's outside. That's physically impossible: the   
   gravity of what's inside cannot be shielded. No matter how small the   
   difference of the gravity associated with one outcome may be, relative   
   to the gravity associated with the other outcome, the MERE EXISTENCE,   
   alone, of any difference at all means you cannot have coherence!   
      
   Mathematically, they're not even in the same state space. You cannot   
   coherently superpose two states that lie in two space-time geometries   
   that disagree with one another on which frames are inertial/free-fall!   
   That's a train that collides directly with the Hawking-Unruh effect,   
   amongst others.   
      
   That, more than anything else, is also the primary obstruction against   
   the creation of any fully-quantized theory of gravity (i.e. any quantum   
   theory (a) with classical general relativity as its classical limit in   
   which (b) the Weyl tensor is a q-number.)   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)