Modified Chaplygin Gas and Constraints on its B parameter from CDM and UDME Cosmological models

Details Modified Chaplygin Gas and Constraints on its B parameter from CDM and UDME Cosmological models Modified Chaplygin Gas and Constraints on its B parameter from CDM and UDME Cosmological models

2009-05-14

arxiv.org/abs/0905.2281v2

Mon. Not. R. Astron. Soc. 397, 1935 (2009)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 10 figs

Scientific paper

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 ($p=B \rho - \frac {A}{\rho^\alpha} $) involves three parameters: $B$, $A$ and $\alpha$. The permitted values of these parameters are determined with the help of dimensionless age parameter ($H_{o}t_{o}$) and $H(z)-z$ Data. Specifically we study the allowed ranges of values of B parameter in terms of $\alpha$ and $A_{s}$ ($A_{s}$ is defined in terms of the constants in the theory). We explore the constraints of the parameters in Cold Dark Matter(CDM) model and UDME(Unified Dark Matter Energy) model respectively.

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