Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microlensing by free-floating brown dwarfs   We propose a near-infrared microlensing survey of the central 2 degree field
of the Galactic Center, in an attempt to estimate the surface density and mass
distribution of distant free-floating brown dwarfs in the bulge and in the
disk, acting as lenses of bright stars towards the Galactic Center. We estimate
the probability (optical depth) of microlensing events to be 10^{-7} and the
typical timescale (full-width) of the amplification lightcurve to be about 1
week. The necessary wide-field NIR survey technology should soon be available
on UKIRT, CFHT, and with VISTA at ESO/Paranal.

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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-ex