A combined team of physicists from the University of Sussex and the National Physical Laboratory, both in the U.K., has been designing experiments to identify ultra-light dark matter particles. In their paper published in the open-access New Journal of Physics, the group describes how they are attempting to use the high precision of atomic clocks to detect ultra-light dark matter particle 'kicks' that would lead to time variations and, in so doing, would show evidence of dark matter.
/HM data counted by NPL's femtosecond frequency comb, with data averaged over 1 s intervals. Bottom: Fractional frequency ratio of Cs/HM data produced by NPL's cesium fountain, NPL-CsF2, with data averaged over 600 s intervals. Data were collected between 1st and 14th July 2019 . Credit:A combined team of physicists from the University of Sussex and the National Physical Laboratory, both in the U.K., has been designing experiments to identify ultra-light dark matter particles.
Currently, dark matter is not something that has been shown to exist—instead it is more of a placeholder that has been created to explain observations of deviations from the Standard Model of physics—like certain gravitational effects on galaxies. Since its development as a theory back in the early 1930s, physicists around the world have been developing theories and experiments to prove that it exists.
Sadly, despite a lot of time and effort, no such proof has been found. In this new effort, the team in the U.K. is working on a novel way to add credence to dark matter theories—using atomic clocks to detect ultra-light dark matter particles. Atomic clocks achieve their precision by taking advantage of the precision inherent in atomic resonance—
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