Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dark Energy Constraints from the CTIO Lensing Survey   We perform a cosmological parameter analysis of the 75 square degree CTIO
lensing survey in conjunction with CMB and Type Ia supernovae data. For Lambda
CDM cosmologies, we find that the amplitude of the power spectrum at low
redshift is given by sigma_8 = 0.81 (+0.15,-0.10, 95% c.l.), where the error
bar includes both statistical and systematic errors. The total of all
systematic errors is smaller than the statistical errors, but they do make up a
significant fraction of the error budget. We find that weak lensing improves
the constraints on dark energy as well. The (constant) dark energy equation of
state parameter, w, is measured to be -0.89 (+0.16,-0.21, 95% c.l.).
Marginalizing over a constant $w$ slightly changes the estimate of sigma_8 to
0.79 (+0.17, -0.14, 95% c.l.). We also investigate variable w cosmologies, but
find that the constraints weaken considerably; the next generation surveys are
needed to obtain meaningful constraints on the possible time evolution of dark
energy.

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The categories of this paper are: chem-ph
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th