From: tjroberts137@sbcglobal.net   
      
   On 10/1/17 11:20 AM, Gerry Quinn wrote:   
   > if we assume that gravity is an effective spin-2 field, we expect it to   
   > break down at some point.  The Schwarzschild radius is the obvious point,   
      
   Why? Remember that a horizon is a global property of the manifold, and "all   
   physics is local" [Einstein and others]. For black holes more massive than the   
   sun, the LOCAL properties of spacetime at the horizon are not remarkable at   
   all.   
   For a super-massive black hole, the LOCAL properties at the horizon are less   
   extreme than here on earth.   
      
   The "obvious" point for our models to break down is near the singularity.   
   That's   
   where local properties of the manifold become extreme, and something new must   
   happen. This is also a region where the topology is very different from   
   anything   
   we are familiar with, and that could be important.   
      
   Tom Roberts   
      
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