Experimental test of special relativity by laser spectroscopy

C. Novotny, B. Bernhardt, G. Ewald, Christopher Geppert, G. Gwinner, T. W. Hänsch, R. Holzwarth, Gerhard Huber, Sergei Karpuk, H. J. Kluge, Thomas Kühl, Wilfried Nörtershäuser, S. Reinhardt, G. Saathoff, D. Schwalm, T. Udem & A. Wolf
The Doppler-free laser-spectroscopic frequency measurement of Doppler-shifted optical lines in forward and backward direction of a fast ion beam permits a sensitive test of the relativistic Doppler-formula and, hence, the relativistic time dilation factor γSR=(1−ν2/c2)−1/2. An experiment on metastable 7Li+, stored at a velocity of v = 0.064c in the Heidelberg heavy-ion storage ring TSR, has confirmed time dilation with unprecedented accuracy. Latest tests at two different ion-velocities (v = 0.03c and v = 0.064c)...
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