Recently, Takamoto et al. (2020) have discussed high precision measurements of gravity induced time dilation effects on optical lattice clocks located near the Earth surface. A relative tick frequency change, δν/ν0=(49 337.8±4.3)10-18, is found between two optical lattice clocks, one located at the ground floor, h=0 m, and the second one at an altitude hexp=452.596 m, on the Skytree tower in Tokyo. The results are compared with the predictions of Einstein's equivalence principle (EEP) estimated as an average over gravimeter measurements at h=0 m and h=450 m. We present a different derivation of the EEP prediction based on the calculation of the effective gravitational potential on the ground floor and at h=hexp, in excellent agreement with the value δν/ν0, providing an independent method to validate the differences in time dilation measured experimentally. In addition, we obtain the next-order correction to the present results, which may be tested in future more accurate experiments.
Roman, H. (2020). Time dilation effects on Earth surface: Optical lattice clocks measurements. PHYSICAL REVIEW D, 102(8) [10.1103/PhysRevD.102.084064].
Time dilation effects on Earth surface: Optical lattice clocks measurements
Roman H. E.
2020
Abstract
Recently, Takamoto et al. (2020) have discussed high precision measurements of gravity induced time dilation effects on optical lattice clocks located near the Earth surface. A relative tick frequency change, δν/ν0=(49 337.8±4.3)10-18, is found between two optical lattice clocks, one located at the ground floor, h=0 m, and the second one at an altitude hexp=452.596 m, on the Skytree tower in Tokyo. The results are compared with the predictions of Einstein's equivalence principle (EEP) estimated as an average over gravimeter measurements at h=0 m and h=450 m. We present a different derivation of the EEP prediction based on the calculation of the effective gravitational potential on the ground floor and at h=hexp, in excellent agreement with the value δν/ν0, providing an independent method to validate the differences in time dilation measured experimentally. In addition, we obtain the next-order correction to the present results, which may be tested in future more accurate experiments.File | Dimensione | Formato | |
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