Computer Science – Performance
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phrvd..59j2004l&link_type=abstract
Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 59, Issue 10, 15 May 1999, id. 102004
Computer Science
Performance
2
Experimental Tests Of Gravitational Theories
Scientific paper
The detailed design of a high-accuracy orbiting relativity-gyroscope experiment is described, and the performance calculations are given. A pure unsupported gyroscope in a spinning drag-free satellite at ambient temperatures with conventional optical instrumentation can determine the geodetic relativity drift with errors as low as 0.05 μas/yr, an improvement of 103-104 over the current GP-B experiment. Recent theoretical work has suggested that under certain assumptions, the deviation of the modified Eddington parameter, 1-γ~1/ωJBD, from its value of zero in general relativity should lie in the range 10-4-10-33 with some evidence that the most likely values are between 10-5 and 10-9. The experiment described here could measure 1-γ to an accuracy of about 7×10-9, and this would extend the current experimental bound on 1-γ by over five orders of magnitude. In fact, the accuracy may be sufficient to see a massless dilaton as predicted by string theory. In addition if a nearby reference star is chosen, it is sensitive enough to possibly detect Earth-sized planets. The experiment is designed to change altitude and be repeatable, and a series of 1-yr measurements at various altitudes increases confidence in the results, determines the experiment errors, and is necessary for a unique interpretation of the data.
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