Relativistic deflection of radio signals in the solar gravitational field measured with vlbi

ABSTRACT For an observer on Earth the general theory of relativity (GR) predicts an apparent outward displacement of a star seen at the Sun's limb of 1.75 arc s. A generalized

formulation for gravitational deflection of light1 includes a parameter _γ_ which ranges from 1 (GR) to −1 (no deflection). Early total eclipse measurements2 constrained _γ_ by 20–40%,

permitting alternative gravitational theories (for example, ref. 3). Radio interferometer measurements of deflections of extragalactic objects4,5 and timing measurements of spacecraft

signals6 have all been consistent with GR with increasing accuracy. We now report the most sensitive measurement of deflection so far achieved, in which very long baseline interferometry

(VLBI) observations yield a value of _γ_ of 1.008 with a 1 _σ_ formal standard error of ±0.005. Access through your institution Buy or subscribe This is a preview of subscription content,

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OPTIONS: * Log in * Learn about institutional subscriptions * Read our FAQs * Contact customer support SIMILAR CONTENT BEING VIEWED BY OTHERS DETECTING FUNDAMENTAL FIELDS WITH LISA

OBSERVATIONS OF GRAVITATIONAL WAVES FROM EXTREME MASS-RATIO INSPIRALS Article 10 February 2022 EVENT HORIZON TELESCOPE OBSERVATIONS OF THE JET LAUNCHING AND COLLIMATION IN CENTAURUS A

Article Open access 19 July 2021 OPTICAL SUPERLUMINAL MOTION MEASUREMENT IN THE NEUTRON-STAR MERGER GW170817 Article 12 October 2022 REFERENCES * Misner, C. W., Thorne, K. S. & Wheeler,

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Services, National Ocean Service, NOAA, Rockville, Maryland, 20852, USA D. S. Robertson & W. E. Carter Authors * D. S. Robertson View author publications You can also search for this

author inPubMed Google Scholar * W. E. Carter View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS

ARTICLE CITE THIS ARTICLE Robertson, D., Carter, W. Relativistic deflection of radio signals in the solar gravitational field measured with VLBI. _Nature_ 310, 572–574 (1984).

https://doi.org/10.1038/310572a0 Download citation * Received: 17 April 1984 * Accepted: 12 June 1984 * Issue Date: 16 August 1984 * DOI: https://doi.org/10.1038/310572a0 SHARE THIS ARTICLE

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