From: goldenfieldquaternions@gmail.com   
      
   On Tuesday, August 29, 2017 at 2:21:38 AM UTC-5, Tom Roberts wrote:   
   > On 8/22/17 1:44 AM, Lawrence Crowell wrote:   
   >> You can think of a graviton in the weak field limit, where gravitons do not   
   >> interact with each other, as similar to a pair of photons in an entangled   
   >> triplet state.   
   >   
   > Hmmmm. I strongly suspect you can think of gravitons ONLY in the weak-field   
   > limit. We don't have a theory of quantum gravity, so the best we can do   
   today is   
   > consider analogies. The relevant analogy, of course, is photons in QED. But   
   > photons are not fundamental to QED, they arise in its perturbation expansion   
   --   
   > i.e. in the weak-field limit. QED has no photon-photon vertex; we have never   
   > tested it with strong fields, but if we did we might find that additional   
   > vertices need to be added....   
   >   
   > The analogy breaks down, of course, because we don't know of any plausible   
   > scenarios with strong-field QED, but we do expect strong-field quantum   
   gravity   
   > near the classical singularities inside black holes (and elsewhere).   
   >   
   > Tom Roberts   
      
   In the strong field limit this would still hold. In the near field   
   limit, or extremely strong limit, you have different spacetime. There is   
   the Sach's peeling theorem that shows the nearest field limit is the   
   black hole or type D solution, then there are type II and type III   
   solutions and then further out type N solutions for gravitational   
   waves. What I say with weak field limit should hold for type N   
   solutions. With type II and III solutions (Robinson-Trautman solutions)   
   what amount to gravitational waves couple heavily with themselves. Here   
   things may be different.   
      
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