Limits on gravitational Einstein Equivalence Principle violation from monitoring atomic clock frequencies during a year

Abstract

Sun's gravitation potential at earth varies during a year due to varying Earth-Sun distance. Comparing the results of very accurate measurements of atomic clock transitions performed at different time in the year allows us to study the dependence of the atomic frequencies on the gravitational potential. We examine the measurement data for the ratio of the frequencies in Hg${}^{+}$ and Al${}^{+}$ clock transitions and absolute frequency measurements (with respect to caesium frequency standard) for Dy, Sr, H, hyperfine transitions in Rb and H, and obtain significantly improved limits on the values of the gravity related parameter of the Einstein Equivalence Principle violating term in the Standard Model Extension Hamiltonian $c_{00}=(3.0\pm 5.7)\times 10^{-7}$ and the parameter for the gravity-related variation of the fine structure constant ${\kappa }_{\alpha }=(-5.3\pm 10)\times 10^{-8}$.

5 pages, 1 figure, 3 tables

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• Lorentz and CPT Tests with Clock-Comparison Experiments
• Test of Einstein equivalence principle near the Galactic center supermassive black hole
• United test of the equivalence principle at $10^{-10}$ level using mass and internal energy specified atoms
• Probing the Gravitational Dependence of the Fine-Structure Constant from Observations of White Dwarf Stars
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• Universal ultra-robust interrogation protocol with zero probe-field-induced frequency shift for quantum clocks and high-accuracy spectroscopy
• An extended-cavity diode laser at 497 nm for laser cooling and trapping of neutral strontium
• Absolute frequency measurement of a Yb optical clock at the limit of the Cs fountain
• Constraints on the Variation of Physical Constants, Equivalence Principle Violation, and a Fifth Force from Atomic Experiments
• The Os${}^{16+}$ and Ir${}^{17+}$ ions as candidates for accurate optical clock sensitive to physics beyond standard model
• Constraints on violation of Lorentz symmetry with clock-comparison redshift experiments
• Towards Adoption of an Optical Second: Verifying Optical Clocks at the SI Limit
• Nonminimal Lorentz Violation in Macroscopic Matter