2016/08/22 by V. A. Dzuba, V. V. Flambaum · 1 citation
Physics and Astronomy · #Advanced Frequency and Time Standards #Atomic and Subatomic Physics Research #Atomic clock #Atomic physics #Computational physics #Einstein #Equivalence principle (geometric) #Frequency standard #Gravitation #Gravitational constant #Hyperfine structure #Physics #Quantum mechanics #Radioactive Decay and Measurement Techniques #physics.atom-ph
paper · pdf · doi:10.1103/physrevd.95.015019
published as Phys. Rev. D 95, 015019 (2017) · 5 pages, 1 figure, 3 tables
arxiv created 2016/08/22 · openalex publication_date 2017/01/24 · arxiv updated 2017/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The Sun's gravitational 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 times 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 the 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 electron sector of the Standard Model extension Hamiltonian c00=(\ensuremath-3.0\ifmmode±\else\textpm\fi5.7)\ifmmode×\else\texttimes\fi10^\ensuremath-7 and the parameter for the gravity-related variation of the fine structure constant \ensuremathκ_\ensuremathα=(\ensuremath-5.3\ifmmode±\else\textpm\fi10)\ifmmode×\else\texttimes\fi10^\ensuremath-8.