Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microlensing by the Halo MACHOs with Spatially Varying Mass Function   The main aim of microlensing experiments is to evaluate the mean mass of
massive compact halo objects (MACHOs) and the mass fraction of the Galactic
halo made by this type of dark matter. Statistical analysis shows that by
considering a Dirac-Delta mass function (MF) for the MACHOs, their mean mass is
about that of a white dwarf star. This result is, however, in discrepancy with
other observations such as those of non-observed expected white dwarfs in the
Galactic halo which give rise to metal abundance, polluting the interstellar
medium by their evolution. Here we use the hypothesis of the spatially varying
MF of MACHOs, proposed by Kerins and Evans to interpret microlensing events. In
this model, massive lenses with a lower population contribute to the
microlensing events more frequently than do dominant brown dwarfs. This effect
causes the mean mass of the observed lenses to be larger than the mean mass of
all the lenses. A likelihood analysis is performed to find the best parameters
of the spatially varying MF that are compatible with the duration distribution
of Large Magellanic Cloud microlensing candidates of the MACHO experiment.

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The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: supr-con