Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Science, Technology and Mission Design for the Laser Astrometric Test Of
  Relativity   The Laser Astrometric Test Of Relativity (LATOR) is a Michelson-Morley-type
experiment designed to achieve a major improvement in the accuracy of the tests
of relativistic gravity in the solar system. By using a combination of
independent time-series of gravitational deflection of light in the immediate
proximity to the Sun, along with measurements of the relativistic time delay on
interplanetary scales (to a precision respectively better than 0.1 picoradians
and 1 cm), LATOR will measure the key post-Newtonian Eddington parameter \gamma
with accuracy of one part in a billion - a factor of 30,000 improvement
compared to the present best result, Cassini's 2003 test. LATOR's primary
measurement pushes to unprecedented accuracy the search for cosmologically
relevant scalar-tensor modifications of gravity by looking for a remnant scalar
field in today's solar system. We present a comprehensive discussion of the
science objectives, proposed technology, mission and optical designs, as well
as the expected performance of this fundamental physics experiment in space.

16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph