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arXiv 1310.2152astro-ph.CO
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微扰模型中精细结构常数的空间变化

Spatial variations of the fine-structure constant in symmetron models

Marvin F. Silva, Hans A. Winther, David F. Mota, C. J. A. P. Martins

摘要:

利用N体模拟研究了玻色子模型中精细结构常数α的变化,计算了不同红移下α的全空间分布.特别是,我们得到模拟的天空地图,这种变化,并确定其功率谱。我们发现,在高密度的空间区域(如暗物质晕的深处),α的值接近地球上测量的值。在晕圈的低密度区,标量场值可以接近对称性破缺值,导致α值的显著差异。如果标量-光子耦合强度βγ为1阶,我们发现暗物质晕中α的变化可以与Webb等人最近声称的偶极变化具有相同的量级。重要的是,我们的结果还表明,在低红移对称性破缺的情况下,这些模型表现出α对回望时间的某种依赖性(与纯空间偶极子相反),原则上可以通过足够精确的光谱测量来检测,例如ALMA和ELT-HIRES。

英文摘要:

We investigate the variation of the fine-structure constant, α, in symmetron models using N-body simulations in which the full spatial distribution of α at different redshifts has been calculated. In particular, we obtain simulated sky maps for this variation, and determine its power spectrum. We find that in high-density regions of space (such as deep inside dark matter halos) the value of α approaches the value measured on Earth. In the low-density outskirts of halos the scalar field value can approach the symmetry breaking value and leads to significantly different values of α. If the scalar-photon coupling strength βγ is of order unity we find that the variation of α inside dark matter halos can be of the same magnitude as the recent claims by Webb et al. of a dipole variation. Importantly, our results also show that with low-redshift symmetry breaking these models exhibit some dependence of α on lookback time (as opposed to a pure spatial dipole) which could in principle be detected by sufficiently accurate spectroscopic measurements, such as those of ALMA and the ELT-HIRES.

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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