SPT-SZ和XMM-Newton联合观测对精细结构常数变化的约束
Constraints on variation of fine structure constant from joint SPT-SZ and XMM-Newton observations
摘要：
我们搜索的电磁精细结构常数（$α\equiv e^2/\hbar c$）的变化使用的样本58 SZ选定的集群在红移范围内（$0.2<z<1.5$）由南极望远镜检测，随着X射线测量使用XMM-牛顿天文台。我们使用集成的SZ Compto电离的X射线对应物的比率作为我们的观测值进行搜索。我们首先得到一个模型无关的约束$α$约0.7%，使用的事实，即上述比例是常数作为红移的函数。然后，我们寻找一个对数依赖的$α$作为红移的函数：$Δα/α= -γ\ln(1+z)$，因为这是预测的失控介子模型。我们发现$γ$ = $-0.046 \pm 0.1$，这表明$α$作为红移的函数不存在对数变化。我们还搜索了偶极变化的精细结构常数使用相同的集群样本。我们没有发现这种空间变化的任何证据。
英文摘要：
We search for a variation of the electromagnetic fine structure constant ($α\equiv e^2/\hbar c$) using a sample of 58 SZ selected clusters in the redshift range ($0.2<z<1.5$) detected by the South Pole Telescope, along with X-ray measurements using the XMM-Newton observatory. We use the ratio of the integrated SZ Compto-ionization to its X-ray counterpart as our observable for this search. We first obtain a model-independent constraint on $α$ of about 0.7%, using the fact that the aforementioned ratio is constant as a function of redshift. We then look for a logarithmic dependence of $α$ as a function of redshift: $Δα/α= -γ\ln(1+z)$, as this is predicted by runaway dilaton models. We find that $γ$ = $-0.046 \pm 0.1$, which indicates that there is no logarithmic variation of $α$ as a function of redshift. We also search for a dipole variation of the fine structure constant using the same cluster sample. We do not find any evidence for such a spatial variation.
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