1.
Phys Rev Lett
; 92(12): 121101, 2004 Mar 26.
Article
in English
| MEDLINE
| ID: mdl-15089661
ABSTRACT
We used very-long-baseline interferometry (VLBI) to measure the deflection by the Sun of radio waves emanating from distant compact radio sources. This bending is characterized in the parametrized post-Newtonian formalism by gamma, which is unity in general relativity. Using a large geodetic VLBI data set, we obtained gamma=0.9998(3)+/-0.0004(5) (estimated standard error). We found no systematic biases from our analysis of subgroups of data.