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   PR # 21164
      Observing group of galaxies which is assigned high M/L value by a  
    optical  observation, we try to identify "tiny deep potential". If   
    the dark matter  has a universal temperature as it is predicted by   
    classical model of WIMPs, a comprehensive relationship between the   
    diameter of bound system and density of dark matter (or depth of     
    potential)should be estabished.  In the othrehand, if the dark matter
    is made of barionic matter,  this kind of relation could be broken by
    a dissipative process of angular  momentum.  If we confirm "tiny     
    potential", it will provide a strong evidence for  barionic dark     
    matter. And if potential is not so deep as it is expected  by optical
    M/L, non barionic dark matter is prefered.                           
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