From: g_d_pusch_remove_underscores@xnet.com   
   Copy: siriusblack@hotpop.com   
      
   "Sirius Black"  writes:   
      
   > Can anyone give me a basic definition of what the "Holographic Principle"   
   > is, exactly?   
      
   This is really a "quantum physics" question, not a "space" question,   
   but basically it Gerard 't Hooft's twofold conjecture, inspired by   
   Plato's "Cave" metaphor, that:   
      
   1.)  All the quantum information that can be contained _within_ a region   
     of space can be completely described by the information that can be   
     specified on the _boundary_ of that region of space, and   
      
   2.)  The amount of quantum information that can be specified on that   
     boundary can represent at most one quantum degree of freedom per   
     "planck area"   
      
   The names is chosen vageuly in analogy with the fact that a hologram, which   
   is a two-dimensional object, can provide an (approximate) representation of   
   a portion of the three-dimensional wavefronts generated by reflection of a   
   coherent light source off a three-dimensional object.   
      
   BTW, you could have quit easily learned this yourself simply by googling on   
   the exact phrase "Holographic Principle."   
      
      
   -- Gordon D. Pusch   
      
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