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We investigate the impact of a nonstandard time evolution of the dark matter component on current cosmological bounds from cosmic microwave background (CMB) anisotropies. We found that a less than 0. 1% variation in the effective dark matter equation of state w₃₌ can drastically change current CMB bounds on the matter density, the Hubble parameter and the age of the Universe. A flat universe without dark energy could provide an excellent fit to current CMB data, providing that w₃₌-10^-2.
Calabrese et al. (Wed,) studied this question.