Variable viscous generalized cosmic Chaplygin gas (GCCG) was constructed in the presence of cosmological constant and space curvature. Using the numerical analysis we find behavior of some cosmological quantities such as Hubble and deceleration parameters. Observational data is used to fix solution and stability of model is discussed.
We study interacting modified Chaplygin gas, which has shear and bulk viscosities. We assume bulk viscosity is a function of density, and also consider sign-changeable interaction. Interaction is assumed between modified Chaplygin gas and baryonic matter. Then, the effects of viscosities on the cosmological parameters, such as energy, density, Hubble expansion parameter, scale factor, and deceleration parameter, are investigated. We can consider this model as a toy model of our universe. PACS Nos.: 95.35.+d, 95.85.−e, 98.80.−k. Résumé : Nous étudions ici un gaz modifié de Chaplygin en interaction qui a des viscosités de cisaillement et volumique. Nous posons que la viscosité volumique est une fonction de la densité et nous considérons une interaction de signe interchangeable. Nous supposons une interaction entre le gaz de Chaplygin modifié et la matière baryonique. Dans ces conditions, nous analysons les effets des viscosités sur les paramètres cosmologiques, comme l'énergie, la densité, le paramètre d'expansion de Hubble, le facteur d'échelle et le paramètre de décélération. Nous considérons ce modèle comme un modèle jouet de notre univers. [Traduit par la Rédaction]
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