From: jos.bergervoet@xs4all.nl   
      
   It would seem that, leaving gravitons aside, glueballs in   
   quarkless QCD could only decay to other glueballs, so the   
   lightest one is stable. (If there is a lightest one [1] of   
   course.)   
      
   The heavier ones, however, may also be stable because of   
   conservation laws prohibiting their decay to the lightest   
   one. But one would expect that very heavy ones would be   
   likely to find a way to some combination of lighter ones   
   with the right quantum numbers.   
      
   So I was wondering:   
   How many stable glueball modes are expected? Will this   
   indeed be a finite number, or is there still a way to get   
   a tower of infinitely many stable modes?   
      
   [1] Actually I see no update on the Clay Millennium Prize   
   status after 2004:    
      
   --   
   Jos   
      
   --- SoupGate-Win32 v1.05   
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