Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gamma-ray bursts as dark energy-matter probes in the context of the
  generalized Chaplygin gas model   In this paper we consider the use of Gamma Ray Bursts (GRBs) as distance
markers to study the unification of dark energy and dark matter in the context
of the so-called Generalized Chaplygin Gas (GCG) model. We consider that the
GRB luminosity may be estimated from its variability, time-lag, and also use
the so-called Ghirlanda relation. We evaluate the improvements one may expect
once more GRBs and their redshift become available. We show that although GRBs
allow for extending the Hubble diagram to higher redshifts, its use as a dark
energy probe is limited when compared to SNe Ia. We find that the information
from GRBs can provide some bounds on the amount of dark matter and dark energy
independently of the equation of state. This is particularly evident for
XCDM-type models, which are, for low-redshifts ($z\leq2$), degenerate with the
GCG.

29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph