Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: D/H in a new Lyman limit quasar absorption system at z=3.256 towards
  PKS1937-1009   We have identified a new Lyman limit absorption system towards PKS1937-1009,
with log N(HI)=18.25 +/- 0.02 at z=3.256. It is suitable for measuring D/H, and
we find a 68.3% confidence range for D/H of 1.6^{+0.25}_{-0.30} \times 10^{-5},
and a 95.4% range of 1.6^{+0.5}_{-0.4} \times 10^{-5}. The metallicity of the
cloud where D/H was measured is low, [Si/H] = -2.0 +/- 0.5. At these
metallicities we expect that D/H will be close to the primordial value. Our D/H
disagrees at a level of 99.4% with the predicted D/H using the baryon density
calculated from the cosmic background radiation measured by WMAP,
2.60^{+0.19}_{-0.17} \times 10^{-5}. Our result also exacerbates the scatter in
D/H values around the mean primordial D/H.

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The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: nlin
30
The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph