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Article overview
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Improved limits for violations of local position invariance from atomic clock comparisons | R. Lange
; N. Huntemann
; J. M. Rahm
; C. Sanner
; H. Shao
; B. Lipphardt
; Chr. Tamm
; S. Weyers
; E. Peik
; | Date: |
13 Oct 2020 | Abstract: | We compare two optical clocks based on the $^2$S$_{1/2}(F=0) o
{}^2$D$_{3/2}(F=2)$ electric quadrupole (E2) and the $^2$S$_{1/2}(F=0) o
{}^2$F$_{7/2}(F=3)$ electric octupole (E3) transition of $^{171}$Yb$^{+}$ and
measure the frequency ratio
$
u_{mathrm{E3}}/
u_{mathrm{E2}}=0.932,829,404,530,965,376(32)$. We
determine the transition frequency $
u_{E3}=642,121,496,772,645.10(8)$ Hz
using two caesium fountain clocks. Repeated measurements of both quantities
over several years are analyzed for potential violations of local position
invariance. We improve by factors of about 20 and 2 the limits for fractional
temporal variations of the fine structure constant $alpha$ to
$1.0(1.1) imes10^{-18}/mathrm{yr}$ and of the proton-to-electron mass ratio
$mu$ to $-8(36) imes10^{-18}/mathrm{yr}$. Using the annual variation of the
Sun’s gravitational potential at Earth $Phi$, we improve limits for a
potential coupling of both constants to gravity, $(c^2/alpha)
(dalpha/dPhi)=14(11) imes 10^{-9}$ and $(c^2/mu) (dmu/dPhi)=7(45) imes
10^{-8}$. | Source: | arXiv, 2010.06620 | Services: | Forum | Review | PDF | Favorites |
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