The relic density of weakly interacting massive particles (WIMPs) depends on the entropy and the expansion rate of the Universe when they freeze out, at a temperature in the range 100 MeV - lOGeV, We use recent calculations of the QCD pressure to produce a new equation of state suitable for use in relic density calculations. We show that relic densities calculated by the dark matter package DarkSUSY receive corrections of several %, within the observational accuracy of current (WMAP) and future (Planck) CMB missions.
展开▼
