Abstract
We study the implications on both background and perturbation evolution of introducing a Chaplygin gas component in the universe's ingredients. We perform likelihood analyses using wide-ranging, SN1a, CMB and large scale structure observations to assess whether such a component could be a genuine alternative to a cosmological constant, $\ensuremath{\Lambda}.$ We find that the current data favors behavior in an adiabatic Chaplygin gas that is akin to a cosmological constant.
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