Juan Barranco, Argelia Bernal, Dario Nunez
We obtain a dark matter equation of state by using the rotation curves of galaxies only. Dark matter is modeled as a fluid component with pressure and we show that, within the Newtonian limit, the resulting equation of state is compatible with existing cosmological bounds. An upper bound on the central pressure of the dark matter is obtained, within the full general relativistic treatment, by demanding that the dark matter fulfills the positive energy condition.
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http://arxiv.org/abs/1301.6785
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