Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Evolution of the Lyman Alpha Forest From Redshift 3 to 0   I review results obtained from studies of the high-redshift Lyman alpha
forest, and present new results from HST/STIS spectra of low-redshift quasars
in comparison with cosmological hydrodynamic simulations. The evolution of the
Lyman alpha forest from redshift 3 to 0 is well-described by current structure
formation models, in which Ly-a forest absorbing gas at all redshifts traces
moderate-overdensity large-scale structures. I describe some of the insights
provided by hydrodynamic simulations into the observed statistical trends of
Ly-a absorbers and the physical state of the absorbing gas.

18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int