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arXiv 1508.00985astro-ph.CO
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标量耦合对电磁场的约束

Constraints on scalar coupling to electromagnetism

Ioannis Antoniou

摘要:

通过实验和观测的限制,我们回顾了标量场(类轴子粒子)与电磁场的可能的非最小耦合。这种耦合的动机是从最近的类星体光谱观测表明可能的空间和/或时间变化的精细结构常数。我们考虑$B_F (ϕ) = 1 + gϕ$形式的电子耦合。耦合参数$g$的最强约束来自于弱等效原理测试,该测试施加$g < 1.6 \times 10^{-17}GeV^{-1}$。这个约束足够强,可以排除这类模型是精细结构常数可观察到的宇宙学变化的原因,除非实施变色龙机制。此外,我们认为,一个类似的耦合发生在变色龙宇宙学,另一个候选暗物质粒子,我们估计这两种效果的宇宙学后果。应该澄清的是,这类模型不一定排除在变色龙机制,可以冻结在高密度实验室区域的标量场的动态的存在。

英文摘要:

We review a possible non-minimal coupling (dilatonic) of a scalar field (axion like particle) to electromagnetism, through experimental and observational constraints. Such a coupling is motivated from recent quasar spectrum observations that indicate a possible spatial and/or temporal variation of the fine-structure constant. We consider a dilatonic coupling of the form $B_F (ϕ) = 1 + gϕ$. The strongest bound on the coupling parameter $g$ is derived from weak equivalence principle tests, which impose $g < 1.6 \times 10^{-17}GeV^{-1}$. This constraint is strong enough to rule out this class of models as a cause for an observable cosmological variation of the fine structure constant unless a chameleon mechanism is implemented. Also, we argue that a similar coupling occurs in chameleon cosmology, another candidate dark mater particle and we estimate the cosmological consequences by both effects. It should be clarified that this class of models is not necessarily ruled out in the presence of a chameleon mechanism which can freeze the dynamics of the scalar field in high density laboratory regions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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