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arXiv 1605.03053astro-ph.COgr-qc
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用星系团和普朗克数据约束精细结构常数的空间变化

Constraining spatial variations of the fine structure constant using clusters of galaxies and Planck data

I. de Martino, C. J. A. P. Martins, H. Ebeling, D. Kocevski

摘要:

我们提出了一种改进的方法来约束空间变化的精细结构常数使用星系团。我们利用{ \it Planck} 2013年的数据测量了618个X射线选择星系团的热Sunyaev-Zeldovich效应。然后,我们使用蒙特卡罗马尔可夫链算法,以获得在每个星系团的位置的宇宙微波背景的温度。当拟合三个不同的唯象参数化允许的精细结构常数的值的振幅和偶极子,我们改善了早期的分析结果,涉及集群和CMB功率谱,我们还发现,最适合的方向的一个假设的偶极子是兼容的方向,其他已知的异常。虽然我们目前的数据集的约束力不允许我们测试通过高分辨率光学/紫外光谱获得的精细结构常数偶极子的迹象,我们的研究结果确实突出了星系团将是一个非常强大的工具,以探测基础物理在低红移。

英文摘要:

We propose an improved methodology to constrain spatial variations of the fine structure constant using clusters of galaxies. We use the {\it Planck} 2013 data to measure the thermal Sunyaev-Zeldovich effect at the location of 618 X-ray selected clusters. We then use a Monte Carlo Markov Chain algorithm to obtain the temperature of the Cosmic Microwave Background at the location of each galaxy cluster. When fitting three different phenomenological parameterizations allowing for monopole and dipole amplitudes in the value of the fine structure constant we improve the results of earlier analysis involving clusters and the CMB power spectrum, and we also found that the best-fit direction of a hypothetical dipole is compatible with the direction of other known anomalies. Although the constraining power of our current datasets do not allow us to test the indications of a fine-structure constant dipole obtained though high-resolution optical/UV spectroscopy, our results do highlight that clusters of galaxies will be a very powerful tool to probe fundamental physics at low redshift.

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