Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraining the dark energy with Ly-alpha forest   Statistical properties of gas absorption in high redshift quasars such as
power spectrum and bispectrum allow one to determine the evolution of structure
over the redshift range 2<z<4. Sloan Digital Sky Survey (SDSS) will measure
around 10,000 quasar spectra in this redshift range and will allow one to
determine the growth factor with a few percent accuracy. This allows one to
extend the studies of dark energy to higher redshift and determine the presence
of dark energy if Omega_de>0.1-0.2 at z>2. In combination with low redshift
studies one can place useful limits on the time evolution of the equation of
state.

19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th