Bruno Bertotti (24 December 1930 – 20 October 2018) was an Italian physicist, emeritus professor at the University of Pavia.
[2] He has also obtained a more accurate measurement of the parameter gamma of the parameterized post-Newtonian formalism, with the Cassini radioscience experiment.
[3] The PPN gamma parameter measures the curvature of space in the metric theory of gravitation and it is equal to one in general relativity.
[4] More recent studies [5][6] revealed that the measured value of the PPN parameter gamma is affected by gravitomagnetic effect caused by the orbital motion of Sun around the barycenter of the solar system.
The gravitomagnetic effect in the Cassini radioscience experiment was implicitly postulated by Bertotti as having a pure general relativistic origin but its theoretical value has been never tested in the experiment which effectively makes the experimental uncertainty in the measured value of gamma actually larger (by a factor of 10) than that claimed by Bertotti and co-authors in Nature.