Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing the time dependence of dark energy   A new method to investigate a possible time-dependence of the dark energy
equation of state $w$ is proposed. We apply this methodology to two of the most
recent data sets of type Ia supernova (Union2 and SDSS) and the baryon acoustic
oscillation peak at $z = 0.35$. For some combinations of these data, we show
that there is a clear departure from the standard $\Lambda$CDM model at
intermediary redshifts, although a non-evolving dark energy component ($dw/dz =
0$) cannot be ruled out by these data. The approach developed here may be
useful to probe a possible evolving dark energy component when applied to
upcoming observational data.

8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas