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What is meant by a particle should not overclose the univese? what is overclose?

  1. Jun 10, 2010 #1
    what is meant by a particle should not overclose the univese? what is overclose? is it packed?


    ''The allowed axion mass range, bounded from below by the requirement
    that axions should not overclose the universe and from above by accelerator searches
    and stellar evolution.
     
  2. jcsd
  3. Jun 11, 2010 #2

    Ich

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    Welcome melezmelez,

    I'd interpret it as having more energy density than allowed by cosmological observations.
     
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