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Radio interferometric tests of general relativity

Published online by Cambridge University Press:  01 October 2007

E. B. Fomalont  and
S. Kopeikin
E. B. Fomalont
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA email: efomalon@nrao.edu
S. Kopeikin
Affiliation:
Dept. of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA email: kopeikins@missouri.edu
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Abstract

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Since VLBI techniques produce a microarcsecond positional accuracy of celestial objects, tests of GR using radio sources as probes of a gravitational field have been made. We present the results from two recent tests using the VLBA: in 2005, the measurement of the classical solar deflection; and in 2002, the measurement of the retarded gravitational deflection associated with Jupiter. The deflection experiment measured γ to an accuracy of 3 × 10−4; the Jupiter experiment measured the retarded term to 20% accuracy. The controversy over the interpretation of the retarded term is summarized.

Keywords

gravitationtechniques: interferometricastrometry

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