Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Variable Chaplygin Gas: Constraints from CMBR and SNe Ia   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.

20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
19
The categories of this paper are: eess