Radio Tests of GR

Abstract

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.

4 pages: IAU240

References in corpus (5)

• The Measurement of the Light Deflection from Jupiter: Experimental Results
• Propagation Speed of Gravity and the Relativistic Time Delay
• Gravimagnetism, Causality, and Aberration of Gravity in the Gravitational Light-Ray Deflection Experiments
• Model-Dependence of Shapiro Time Delay and the "Speed of Gravity/Speed of Light" Controversy
• The Light-cone Effect on the Shapiro Time Delay

Cited by in corpus (4)

• Relativistic gravitational deflection of light and its impact on the modeling accuracy for the Space Interferometry Mission
• Gravitomagnetism and gravitational waves
• Forthcoming Close Angular Approaches of Planets to Radio Sources and Possibilities to Use Them as GR Tests
• The gravitomagnetic influence on Earth-orbiting spacecrafts and on the lunar orbit