Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Omega_B and Omega_0 From MACHOs and Local Group Dynamics   We obtain restrictions on the universal baryon fraction, f_B =
Omega_B/Omega_0, by assuming that the observed microlensing events towards the
Large Magellanic Cloud are due to baryonic MACHOs in the halo of the Galaxy and
by extracting a bound to the total mass of the Milky Way from the motion of
tracer galaxies in the Local Group. We find a lower bound f_B >
0.29^{+0.18}_{-0.15}. Consistency with the predictions of primordial
nucleosynthesis leads to the further constraint on the total mass density,
Omega_0 < 0.2.

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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
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The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: dg-ga