Modified Chaplygin gas and constraints on its<i>B</i>parameter from cold dark matter and unified dark matter energy cosmological models

We study modified Chaplygin gas (MCG) as a candidate for dark energy and predict the values of parameters of the gas for a physically viable cosmological model. The equation of state of MCG involves three parameters: B, A and α. The permitted values of these parameters are determined with the help of a dimensionless age parameter (H0t0) and H(z) −z data. Specifically, we study the allowed ranges of values of the B parameter in terms of α and As (As is defined in terms of the parameters in the theory). We explore the constraints of the parameters in the cold dark matter and unified dark matter energy models, respectively.

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