Ruling out the Modified Chaplygin Gas Cosmologies
J.C. Fabris, C. Ogouyandjou, J. Tossa, H.E.S. Velten

TL;DR
This paper evaluates the Modified Chaplygin Gas model as a unified dark energy and dark matter candidate, concluding it is only viable when it reduces to the Generalized Chaplygin Gas, based on perturbative and observational analysis.
Contribution
It provides a perturbative and observational analysis that constrains the Modified Chaplygin Gas model, showing it is only consistent with data when B=0, thus reducing to the GCG model.
Findings
MCG model is not successful unless B=0
Perturbative analysis supports the conclusion
Observational data favor the GCG over MCG
Abstract
The Modified Chaplygin Gas (MCG) model belongs to the class of a unified models of dark energy (DE) and dark matter (DM). It is characterized by an equation of state (EoS) , where the case corresponds to the Generalized Chaplygin Gas (GCG) model. Using a perturbative analysis and power spectrum observational data we show that the MCG model is not a sucessful candidate for the cosmic medium unless . In this case, it reduces to the usual GCG model.
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