Viscous generalized Chaplygin gas as a unified dark fluid
LI Wei
LI Dan
Abstract：In this paper , viscous generalized Chaplygin gas ( VGCG) as a unified dark fluid was revisited . For comparison, the effective pressure pef =p-3ζ0ρwas redefined, whereζ0 is the newly added model parame-ter.The model parameter ζ0 =0.000708 +0.00151+0.00275+0.00425-0.00155-0.00311-0.00503 was obtained in 1,2,3σregions.The results show that the viscous effect is very small and the VGCG model can match observational data points as well as ΛCDM model.
Keywords：bulk viscositycoefficient of viscositydark fluid model
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：3( 119-121 )