Higgs Particles: Space Expansion & Creation of Particles

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Just curious. As Space expands in our universe, does the space between Higgs particles expand or are more particles created to full the void?
 
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As far as I know Higgs particles aren't around under usual conditions. The theory states the existence of a Higgs field, while Higgs particles are supposed to be formed by high energy collisions like in the HLC, but immediately decay.
 
Thanks. I always wondered about that. Does that mean if we did this experiment 8 billion years ago and 3 billion years from now the same amount of particles will be detected?
 
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