Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New Globular Cluster Age Estimates and Constraints on the Cosmic
  Equation of State and The Matter Density of the Universe   New estimates of globular cluster distances, combined with revised ranges for
input parameters in stellar evolution codes and recent estimates of the
earliest redshift of cluster formation allow us to derive a new 95% confidence
level lower limit on the age of the Universe of 11 Gyr. This is now
definitively inconsistent with the expansion age for a flat Universe for the
currently allowed range of the Hubble constant unless the cosmic equation of
state is dominated by a component that violates the strong energy condition.
This solidifies the case for a dark energy-dominated universe, complementing
supernova data and direct measurements of the geometry and matter density in
the Universe. The best-fit age is consistent with a cosmological
constant-dominated (w=pressure/energy density = -1) universe. For the Hubble
Key project best fit value of the Hubble Constant our age limits yields the
constraints w < -0.4 and Omega_matter < 0.38 at the 68 % confidence level, and
w < -0.26 and Omega_matter < 0.58 at the 95 % confidence level.

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The categories of this paper are: physics
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
1
The categories of this paper are: cs
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org