Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Testing power-law cosmology with galaxy clusters   Power-law cosmologies, in which the cosmological scale factor evolves as a
power law in the age, $a \propto t^{\alpha}$ with $\alpha \ga 1$, regardless of
the matter content or cosmological epoch, is comfortably concordant with a host
of cosmological observations.} {In this article, we use recent measurements of
the X-ray gas mass fractions in clusters of galaxies to constrain the $\alpha$
parameter with curvature $k = \pm1, 0$. We find that the best fit happens for
an open scenario with the power index $\alpha = 1.14 \pm 0.05$, though the flat
and closed model can not be rule out at very high confidence level.} {Our
results are in agreement with other recent analyses and show that the X-ray gas
mass fraction measurements in clusters of galaxies provide a complementary test
to the power law cosmology.

28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio