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arXiv 1603.04498astro-ph.COgr-qchep-phhep-th
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精细结构常数空间变化的最新约束

Updated constraints on spatial variations of the fine-structure constant

A. M. M. Pinho, C. J. A. P. Martins

摘要:

Webb { \it et al.}的近期工作提供了精细结构常数$α$的空间变化的指示,在百万分之几的水平。使用293个存档测量的数据集,他们进一步表明偶极子提供了统计学上良好的数据拟合,这一结果随后被其他作者证实。在这里,我们表明,最近的专用测量数据集进一步限制了这些变化:虽然只有10个这样的测量,其不确定性要小得多。我们发现偶极变化仍然很好地拟合组合数据集,但是这样的偶极的幅度必须稍微小一些:完整数据集的$8.1\pm1.7$ ppm,而Webb的$9.4\pm2.2$ ppm { \it et al.}仅数据,均处于$68.3\%$置信水平。对这种偶极子在天空中的方向的约束也得到了显著改善。另一方面,数据还不能区分一个纯粹的空间偶极子和一个额外的红移依赖。

英文摘要:

Recent work by Webb {\it et al.} has provided indications of spatial variations of the fine-structure constant, $α$, at a level of a few parts per million. Using a dataset of 293 archival measurements, they further show that a dipole provides a statistically good fit to the data, a result subsequently confirmed by other authors. Here we show that a more recent dataset of dedicated measurements further constrains these variations: although there are only 10 such measurements, their uncertainties are considerably smaller. We find that a dipolar variation is still a good fit to the combined dataset, but the amplitude of such a dipole must be somewhat smaller: $8.1\pm1.7$ ppm for the full dataset, versus $9.4\pm2.2$ ppm for the Webb {\it et al.} data alone, both at the $68.3\%$ confidence level. Constraints on the direction on the sky of such a dipole are also significantly improved. On the other hand the data can't yet discriminate between a pure spatial dipole and one with an additional redshift dependence.

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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