The light speed versus the observer: the Kennedy–Thorndike test from GRAAL-ESRF View Full Text


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Article Info

DATE

2018-08

AUTHORS

V. G. Gurzadyan, A. T. Margaryan

ABSTRACT

High precision tests of the light speed constancy for all observers as a empirical basis of Special Relativity have continuously been among the goals of advanced experimental studies. Based on the Compton edge method proposed by us (Gurzadyan and Margarian in Phys Scr 53:513, 1996), a constraint on the one-way light speed isotropy and Lorentz invariance violation has been obtained at the dedicated GRAAL experiment at European Synchrotron Radiation Facility (ESRF, Grenoble) (Gurzadyan et al. in Mod Phys Lett A 20:1, 2005, Nuovo Cimento 122:515, 2007, Proceedings of the XII M. Grossmann meeting on general relativity, vol B. World Scientific, p 1495. arXiv:1004.2867, 2012; Bocquet et al. in Phys Rev Lett 104:241601, 2010). Using the GRAAL data we now get a new constraint on one of the key tests of Special Relativity—the Kennedy–Thorndike experiment (Kennedy and Thorndike in Phys Rev 42:400, 1932) in probing light speed invariance with respect to the velocity of the observer (apparatus). Our analysis takes advantage of GRAAL’s setup where two separate energy scales are involved: first, via the position of the Compton edge determining the light speed in the reference frame of incident 6 GeV electrons within the tagging system, second, in the calorimeter via the 1.27 MeV photons of the 22Na source. The two energy scales are engaged to each other through production of η mesons by tagged laser Compton backscattered γ-rays. The accuracy of the calibration and stability of energies reached in each section enable us to obtain the limit of 7×10-12 for the Kennedy–Thorndike test, which improves the currently existing limits by three orders of magnitude. More... »

PAGES

607

References to SciGraph publications

  • 2005-12. Modern Tests of Lorentz Invariance in LIVING REVIEWS IN RELATIVITY
  • 2004-10. Whispering Gallery Resonators and Tests of Lorentz Invariance in GENERAL RELATIVITY AND GRAVITATION
  • 2007-08. Measurement of η photoproduction on the proton from threshold to 1500 MeV in THE EUROPEAN PHYSICAL JOURNAL A
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