Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Linear Theory Power Spectrum from the Lyman-alpha Forest in the
  Sloan Digital Sky Survey   We analyze the SDSS Ly-alpha forest P_F(k,z) measurement to determine the
linear theory power spectrum. Our analysis is based on fully hydrodynamic
simulations, extended using hydro-PM simulations. We account for the effect of
absorbers with damping wings, which leads to an increase in the slope of the
linear power spectrum. We break the degeneracy between the mean level of
absorption and the linear power spectrum without significant use of external
constraints. We infer linear theory power spectrum amplitude
Delta^2_L(k_p=0.009s/km,z_p=3.0)=0.452_{-0.057-0.116}^{+0.069+0.141} and slope
n_eff=-2.321_{-0.047-0.102}^{+0.055+0.131} (possible systematic errors are
included through nuisance parameters in the fit - a factor >~5 smaller errors
would be obtained on both parameters if we ignored modeling uncertainties). The
errors are correlated and not perfectly Gaussian, so we provide a chi^2 table
to accurately describe the results. The result corresponds to sigma_8=0.85,
n=0.94, for a LCDM model with Omega_m=0.3, Omega_b=0.04, and h=0.7, but is most
useful in a combined fit with the CMB. The inferred curvature of the linear
power spectrum and the evolution of its amplitude and slope with redshift are
consistent with expectations for LCDM models, with the evolution of the slope,
in particular, being tightly constrained. We use this information to constrain
systematic contamination, e.g., fluctuations in the UV background. This paper
should serve as a starting point for more work to refine the analysis,
including technical improvements such as increasing the size and number of the
hydrodynamic simulations, and improvements in the treatment of the various
forms of feedback from galaxies and quasars.

36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an