Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recent Developments in Gravitational Microlensing and the Latest MACHO
  Results: Microlensing Towards the Galactic Bulge   We review recent gravitational microlensing results from the EROS, MACHO, and
OGLE collaborations, and present some details of the very latest MACHO results
toward the Galactic Bulge. The MACHO collaboration has now discovered in excess
of 40 microlensing events toward the Galactic Bulge during the 1993 observing
season. A preliminary analysis of this data suggests a much higher microlensing
optical depth than predicted by standard galactic models suggesting that these
models will have to be revised. This may have important implications for the
structure of the Galaxy and its dark halo. Also shown are MACHO data of the
first microlensing event ever detected substantially before peak amplification,
the first detection of parallax effects in a microlensing event, and the first
caustic crossing to be resolved in a microlensing event.

31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
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The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th