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Fig. 2
Age of a polytropic-DM model, t0, in units of tEdS, as a function of the polytropic exponent Γ < 1 (red solid line). For every Γ < 1, t0>tEdS, and t0 approaches tEdS only as Γ → 1. The horizontal solid line denotes the age of the Universe, t0 = 1.483tEdS, in the ΛCDM-limit of the polytropic-DM model (i.e., for Γ = 0).
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