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Dark Matter Equation of State through Cosmic History

Kopp, Michael; Skordis, Constantinos; Thomas, Daniel B. +1 more

Cold dark matter is a crucial constituent of the current concordance cosmological model. Having a vanishing equation of state (EOS), its energy density scales with the inverse cosmic volume and is thus uniquely described by a single number, its present abundance. We test the inverse cosmic volume law for dark matter (DM) by allowing its EOS to var…