Variable Chaplygin Gas: Constraints from CMBR and SNe Ia

Details Variable Chaplygin Gas: Constraints from CMBR and SNe Ia Variable Chaplygin Gas: Constraints from CMBR and SNe Ia

2005-08-23

arxiv.org/abs/astro-ph/0508491v3

Int.J.Mod.Phys.D15:1089-1098,2006

Astronomy and Astrophysics

Astrophysics

9 pages,4 figures

Scientific paper

10.1142/S0218271806008644

We constrain the parameters of the variable Chaplygin gas model, using the location of peaks of the CMBR spectrum and SNe Ia ``gold '' data set. Equation of state of the model is $P=-A(a)/\rho$, where $A(a)=A_0 a^{-n}$ is a positive function of the cosmological scale factor $a$, $A_0$ and $n$ being constants. The variable Chaplygin gas interpolates from dust-dominated era to quintessence dominated era. The model is found to be compatible with current type Ia Supernovae data and location of first peak if the values of $\Omega_m$ and $n$ lie in the interval $[0.017,~0.117]$ and $[-1.3,~2.6]$ respectively.

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