Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Geometrical Diagnostics for Generalized Chaplygin Gas   A new diagnostic method, $Om$ is applied to generalized Chaplygin gas (GCG)
model as the unification of dark matter and dark energy. On the basis of the
recently observed data: the Union supernovae, the observational Hubble data,
the SDSS baryon acoustic peak and the five-year WMAP shift parameter, we show
the discriminations between GCG and $\Lambda$CDM model. Furthermore, it is
calculated that the current equation of state of dark energy $w_{0de}=-0.964$
according to GCG model.

3
The categories of this paper are: physics
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs