Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Lyman-alpha Forest: a Cosmic Gold Mine   In recent years, a remarkably simple physical picture of the Lyman-alpha
forest has emerged, which allows detailed predictions to be made and turns the
forest into a powerful probe of cosmology. We point out ways in which such a
picture can be tested observationally, and explore three areas in which the
Lyman-alpha forest can yield valuable constraints: the reionization history,
the primordial mass power spectrum and the cosmological constant or its
variants. The possibility of combining with other high redshift observations,
such as the Lyman-break galaxy surveys, to provide consistency checks and
complementary information is also discussed.

8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg