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

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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.
 
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Welcome melezmelez,

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