论文标题
改善了违反原子钟比较的局部位置不变性的限制
Improved limits for violations of local position invariance from atomic clock comparisons
论文作者
论文摘要
我们根据$^2 $ s $ _ {1/2}（f = 0）\对两个光学时钟进行比较$^{171} $ yb $^{+} $的过渡频率比率$ $ $ quy $ν_{\ MATHRM {e3}}/ν_ {\ Mathrm {e2}} = 0.932 = 0.932 \，829 \，829 \，4044 \，530 $，365 \，965 \ ,, 965 \，33。365 \，965 \，965 \，，33。365 \，，965。我们确定过渡频率$ν_{e3} = 642 \，121 \，496 \，772 \，645.10（8）$ hz，使用两个cesium fountain时钟。分析了几年内这两个量的重复测量，以违反局部位置不变性。我们通过大约20和2的因素改进，而良好结构的分数时间变化的限制是$α$至$ 1.0（1.1）\ times10^{ - 18}/\ mathrm {yr {yr} $以及质子与电子质量$ $ $ $ $ $ $ $ $ $ $至$ -8（36）\ times10^$ n y rm Using the annual variation of the Sun's gravitational potential at Earth $Φ$, we improve limits for a potential coupling of both constants to gravity, $(c^2/α) (dα/dΦ)=14(11)\times 10^{-9}$ and $(c^2/μ) (dμ/dΦ)=7(45)\times 10^{-8}$.
We compare two optical clocks based on the $^2$S$_{1/2}(F=0)\to {}^2$D$_{3/2}(F=2)$ electric quadrupole (E2) and the $^2$S$_{1/2}(F=0)\to {}^2$F$_{7/2}(F=3)$ electric octupole (E3) transition of $^{171}$Yb$^{+}$ and measure the frequency ratio $ν_{\mathrm{E3}}/ν_{\mathrm{E2}}=0.932\,829\,404\,530\,965\,376(32)$. We determine the transition frequency $ν_{E3}=642\,121\,496\,772\,645.10(8)$ 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 $α$ to $1.0(1.1)\times10^{-18}/\mathrm{yr}$ and of the proton-to-electron mass ratio $μ$ to $-8(36)\times10^{-18}/\mathrm{yr}$. Using the annual variation of the Sun's gravitational potential at Earth $Φ$, we improve limits for a potential coupling of both constants to gravity, $(c^2/α) (dα/dΦ)=14(11)\times 10^{-9}$ and $(c^2/μ) (dμ/dΦ)=7(45)\times 10^{-8}$.
