Radio Tests of GR

Details Radio Tests of GR Radio Tests of GR

2009-12-20

arxiv.org/abs/0912.4038v1

Proceedings of the IAU (2008), editors Jin, Platais and Perryman, 248, 383

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages: IAU240

Scientific paper

Since VLBI techniques give microarcsecond position 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 PPN-gamma to an accuracy of 0.0003; the Jupiter experiment measured the retarded term to 20% accuracy. The controversy over the interpretation of the retarded term is summarized.

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