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Probing unification scenarios with atomic clocks

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 p/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
2012 December

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Instituto de AstrofĆ­sica e CiĆŖncias do EspaƧo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
FundaĆ§Ć£o para a CiĆŖncia e a Tecnologia COMPETE 2020 PORTUGAL 2020 UniĆ£o Europeia