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Gerald Gwinner headshot
March 3, 20164:00 pm – 5:00 pm (CDT)

The Most Accurate Test of Relativistic Time Dilation: How Doppler-Free Spectroscopy Can Measure the Doppler Effect


Gerald Gwinner (University of Mannitoba)


Ania Kwiatkowski



Mitchell Institute for Fundamental Physics & Astronomy

College Station, Texas 77843

Event Details

We report on the concluding results from a series of Ives-Stilwell-type experiments carried out using collinear laser spectroscopy on Li+ ions stored at speeds ranging from 3% to 34% of the speed of light at the TSR and ESR heavy ion storage rings. We have achieved absolute frequency accuracies for optical transitions at the 10^(-10) level, possibly the most accurate measurement ever carried out on accelerated beams. We have verified the relationship between the velocity beta and the time dilation factor gamma to within +/- 2.3 x 10^(-9), setting the tightest limits on deviations of time dilation from Special Relativity. We will discuss the relevance to Lorentz & CPT violating Standard Model extensions.

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