From: goldenfieldquaternions@gmail.com   
      
   On Sunday, January 14, 2018 at 2:54:52 AM UTC-6, Phillip Helbig (undress to   
   reply) wrote:   
      
   [Moderator's note: Quoted text trimmed. -P.H.]   
      
   > The universe appears to be approximately homogeneous on large enough   
   > scales.  Of course a single clump would violate this, but no-one is   
   > proposing a single clump, nor a completely empty bubble.  Rather, the   
   > question is whether it is possible that inhomogeneities---within the   
   > current observational constraints---can have observable effects and   
   > perhaps explain some puzzling observations (though it is fair to say   
   > that not all are puzzled by them).   
      
   My immediate sense is no. The problem is the mass density of the   
   universe is about 10^{-29}g/cm^3. It is difficult to seen how this with   
   ordinary matter gives rise to the accelerated repulsion. I wrote on   
   Stack exchange how dark energy can be understood in part with Newtonian   
   mechanics. It is not hard to understand how a homogeneous distribution   
   of vacuum energy gives rise to accelerated expansion. The problem is   
   understanding the quantum field theory giving rise to that dark energy.   
      
   LC   
      
   https://physics.stackexchange.com/questions/273888/can-a-photon-   
   ave-a-wavelength-less-than-the-planck-length/273900#273900   
      
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