Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct Detection of Gravity Waves through High-Precision Astrometry   It is generally accepted that a first ever direct detection of gravity waves
would herald a new era in astronomy and in fundamental physics. Ever since the
early sixties, increasingly larger human and material resources are being
invested in the detection effort. Unfortunately, the gravity wave effects one
has had to exploit so far are extraordinarily small and are usually very many
orders of magnitude smaller than the noise involved. The detectors that are
presently at the most advanced stage of development hope to register extremely
rare, instantaneous longitudinal shifts that are expected to be orders of
magnitude smaller than one Fermi. However, it was recently shown that gravity
waves can manifest themselves through much larger effects than previously
envisaged. One of these new effects is the periodic, apparent shift in a star's
angular position due to a foreground gravity wave source. The comparative
largeness of this effect stems from its being proportional not to the inverse
of the gravity wave source's distance to the Earth, but to the inverse of its
distance to the star's line of sight. In certain optimal but not unrealistic
cases, the amplitude of this effect can reach the critical bar of one
micro-arcsecond, thus raising the prospect that the long awaited first direct
detection of gravity waves could be achieved by a high precision astrometry
space mission such as GAIA.

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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
19
The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: q-fin
3
The categories of this paper are: physics