Simulation study demonstrates gravitational redshift testing via space station frequency links, indicating potential accuracy two orders of magnitude beyond prior rocket experiments.
In November 2022, the China Space Station (CSS) was equipped with a cold atomic microwave clock and a Sr optical lattice clock with stabilities of 5×10^-14/√τ and 2×10^-15/√τ (where τ is the integration time in seconds), respectively, which provides an excellent opportunity to test gravitational redshift (GRS) with higher accuracy than previous results. Based on high-precision frequency links between the China Space Station and a ground station, we formulated a model and provided simulation experiments to test GRS. Simulation results suggest that this method could test the GRS at the accuracy level of 5×10^-7, more than 2 orders in magnitude higher than the result of the experiment of a hydrogen clock on board a flying rocket more than 40 years ago.
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Shen et al. (2023) studied this question.
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