M. C. Ferreira, M. D. Julićo, C. J. A. P. Martins, A. M. R. V. L. Monteiro
We discuss the usage of measurements of the stability of nature’s fundamental constants coming from comparisons between atomic clocks as a means to constrain coupled variations of these constants in a broad class of unification scenarios. After introducing the phenomenology of these models, we provide updated constraints based on a global analysis of the latest experimental results. We obtain null results for the proton-to-electron mass ratio μ̇/μ = (0.68 ± 5.79) × 10-16 yr-1 and for the gyromagnetic factor ġp/gp = (-0.72 ± 0.89) × 10-16 yr-1 (both of these being at the 95% confidence level). These results are compatible with theoretical expectations on unification scenarios, but much freedom exists due to the presence of a degeneracy direction in the relevant parameter space.
Physical Review D
Volume 86, Issue 12, Page 125025_1