Laboratory Limits on Temporal Variations of Fundamental Constants: An Update

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dc.creatorPeik, E.
dc.creatorLipphardt, B.
dc.creatorSchnatz, H.
dc.creatorTamm, Chr.
dc.creatorWeyers, S.
dc.creatorWynands, R.
dc.date2006-11-09
dc.date.accessioned2026-07-07T10:22:49Z
dc.date.available2026-07-07T10:22:49Z
dc.descriptionPrecision comparisons of different atomic frequency standards over a period of a few years can be used for a sensitive search for temporal variations of fundamental constants. We present recent frequency measurements of the 688 THz transition in the $^{171}$Yb$^+$ ion. For this transition frequency a record over six years is now available, showing that a possible frequency drift relative to a cesium clock can be constrained to $(-0.54\pm0.97)$ Hz/yr, i.e. at the level of $2\cdot10^{-15}$ per year. Combined with precision frequency measurements of an optical frequency in $^{199}$Hg$^+$ and of the hyperfine ground state splitting in $^{87}$Rb a stringent limit on temporal variations of the fine structure constant $α$: $d\lnα/dt= (-0.26\pm0.39)\cdot 10^{-15} {\rm yr}^{-1}$ and a model-dependent limit for variations of the proton-to-electron mass ratio $μ$ in the present epoch can be derived: $d \ln μ/dt = (-1.2 \pm 2.2)\cdot 10^{-15} {\rm yr}^{-1}$. We discuss these results in the context of astrophysical observations that apparently indicate changes in both of these constants over the last 5--10 billion years.
dc.description10 pages, 3 figures, Proceedings of the 11th Marcel Grossmann Meeting, Berlin, 2006
dc.identifierhttps://arxiv.org/abs/physics/0611088
dc.identifierhttp://arxiv.org/abs/physics/0611088
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/175647
dc.subjectAtomic Physics
dc.subjectGeneral Physics
dc.titleLaboratory Limits on Temporal Variations of Fundamental Constants: An Update
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