Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hubble parameter measurement constraints on the cosmological
  deceleration-acceleration transition redshift   We compile a list of 28 independent measurements of the Hubble parameter
between redshifts 0.07 < z < 2.3 and use this to place constraints on model
parameters of constant and time-evolving dark energy cosmologies. These H(z)
measurements by themselves require a currently accelerating cosmological
expansion at about, or better than, 3-sigma confidence. The mean and standard
deviation of the 6 best-fit model deceleration-acceleration transition
redshifts (for the 3 cosmological models and 2 Hubble constant priors we
consider) is $z_{\rm da} = 0.74 \pm 0.05$, in good agreement with the recent
Busca et al. (2012) determination of $z_{\rm da} = 0.82 \pm 0.08$ based on 11
H(z) measurements between redshifts 0.2 < z < 2.3, almost entirely from
BAO-like data.

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The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
3
The categories of this paper are: physics
16
The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
1
The categories of this paper are: cs
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
13
The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin