(English) Limits on Light-Speed Anisotropies from Compton Scattering of High-Energy Electrons

The possibility of anisotropies in the speed of light relative to the limiting speed of electrons is considered. The absence of sidereal variations in the energy of Compton-edge photons at the ESRF’s GRAAL facility constrains such anisotropies representing the first non-threshold collision-kinematics study of Lorentz violation. When interpreted within the minimal Standard-Model Extension, this result yields the two-sided limit of 1.6 x 10^{-14} at 95% confidence level on a combination of the parity-violating photon and electron coefficients kappa_{o+} and c. This new constraint provides an improvement over previous bounds by one order of magnitude.


J. P. Bocquet, D. Moricciani, V. Bellini, M. Beretta, L. Casano, A. D’Angelo, R. Di Salvo, A. Fantini, D. Franco, G. Gervino, F. Ghio, G. Giardina, B. Girolami, A. Giusa, V. G. Gurzadyan, A. Kashin, S. Knyazyan, A. Lapik, R. Lehnert, P. Levi Sandri, A. Lleres, F. Mammoliti, G. Mandaglio, M. Manganaro, A. Margarian, S. Mehrabyan, R. Messi, V. Nedorezov, C. Perrin, C. Randieri, D. Rebreyend, N. Rudnev, G. Russo, C. Schaerf, M. L. Sperduto, M. C. Sutera, A. Turinge, V. Vegna (2010).

Physical Review Letters – June 2010, Vol. 104, Issue 24, pp. 241601-1-241601-5, ISSN: 0031-9007, doi: 10.1103/PhysRevLett.104.241601.


The American Physical Society was founded on May 20th, 1899, when 36 physicists gathered at Columbia University with that aim. They proclaimed the mission of the new Society to be “to advance and diffuse the knowledge of physics”. This has since been the goal of the APS through scientific meetings and journal publication, as well as other activities. In 1913, the APS took over the operation of the Physical Review, which had been founded in 1893 at Cornell, and journal publication became its second major activity.

Physical Review was followed by Reviews of Modern Physics in 1929, and by Physical Review Letters in 1958 (when the then Editor, Sam Goudsmit, decided to collect the Letters to the Editor of Physical Review into a new standalone journal). Physical Review Letters (PRL) is the world’s premier physics letter journal; it publishes short, high quality reports of significant and notable results in the full arc of fundamental and interdisciplinary physics research. Over the years,  has subdivided into five separate sections as the fields of physics have proliferated and the number of submissions grew.

Cristian Randieri

Cristian Randieri is a brilliant intelligent and great proactivity person and an effective communicator and visionary. He has built a strong (and deserved) reputation as someone with vision, diligence and honour. Cristian is not a simple engineer but he is a real Scientist. His knowledge is not restricted to the area it covers, but its impressive passion for all the technical topics led him to acquire great skills even in areas far from his original studies. Cristian is able to address and solve complex technical problems with excellent results. He is a valuable writer with great scientific background formed with more than 15 years of active research on experimental Nuclear Physics performed in the most famous international research laboratories such as CERN, ESRF, INF. He write about HI-Tech solutions topics and advanced research study applied to industry. With more than 150 scientific & technical publications, he is also, a technical and famous writer in Italy due to his interviews released to the most famous Industrial Italian magazines. Actually, he is the President & CEO of Intellisystem Technologies an Italian Research & Developments company committed to develop and sell innovative and advanced solutions.

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