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## Main Question or Discussion Point

Hi, my question is if there exists a study systematically comparing different cosmological models in how well they fit the same standard cosmological data sets (CMB, luminosity, BOA, SNe, lensing,...). I can find very little besides LCDM.

In the rare case of a comparison, it leads to confusion. For instance, Melia claims that a coasting model ("Rh=ct"), i.e. ρ∝a

Apart from this particular case, do comparisons exist of LCDM with the single fluid model where ρ∝a

I would very much appreciate if someone could help out.

In the rare case of a comparison, it leads to confusion. For instance, Melia claims that a coasting model ("Rh=ct"), i.e. ρ∝a

^{-2}fits data beter than LCDM, leading to long (perhaps unnecessary) disputes over the subject, while my impression is that Melia did a serious atempt.Apart from this particular case, do comparisons exist of LCDM with the single fluid model where ρ∝a

^{-1}and with the dual fluid model where ρ_{1}∝a^{-2}, ρ_{2}=ρ_{Λ}∝a^{0}, and possibly other models?I would very much appreciate if someone could help out.