Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The 2dF Galaxy Redshift Survey: Power-spectrum analysis of the final
  dataset and cosmological implications   We present a power spectrum analysis of the final 2dF Galaxy Redshift Survey,
employing a direct Fourier method. The sample used comprises 221,414 galaxies
with measured redshifts. We investigate in detail the modelling of the sample
selection. A new angular mask is derived, based on revisions to the photometric
calibration. The redshift selection function is determined by dividing the
survey according to rest-frame colour, and deducing a self-consistent treatment
of k-corrections and evolution for each population. The covariance matrix for
the power-spectrum estimates is determined using two different approaches to
the construction of mock surveys which are used to demonstrate that the input
cosmological model can be correctly recovered. We are confident that the 2dFGRS
power spectrum can be used to infer the matter content of the universe. On
large scales, our estimated power spectrum shows evidence for the `baryon
oscillations' that are predicted in CDM models. Fitting to a CDM model,
assuming a primordial $n_{s}=1$ spectrum, $h=0.72$ and negligible neutrino
mass, the preferred parameters are $\Omega_{M} h = 0.168 \pm 0.016$ and a
baryon fraction $\Omega_{b} /\Omega_{M} = 0.185\pm0.046$ (1$\sigma$ errors).
The value of $\Omega_{M} h$ is $1\sigma$ lower than the $0.20 \pm 0.03$ in our
2001 analysis of the partially complete 2dFGRS. This shift is largely due to
the signal from the newly-sampled regions of space, rather than the refinements
in the treatment of observational selection. This analysis therefore implies a
density significantly below the standard $\Omega_{M} =0.3$: in combination with
CMB data from WMAP, we infer $\Omega_{M} =0.231\pm 0.021$. (Abridged.)

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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph