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arXiv 2008.13455astro-ph.GA
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标量场暗物质模型从McGaugh观测到的重子加速度关联的结果

Consequences for the Scalar Field Dark Matter model from The McGaugh Observed-Baryon Acceleration Correlation

Luis E. Padilla, Jordi Solís-López, Tonatiuh Matos, Ana Ávilez-López

摘要:

虽然标准的宇宙学模型,即所谓的PDMATHAMM冷暗物质(“$Λ$ CDM”),似乎很好地符合宇宙学水平的观测,但众所周知,它在银河系尺度上有几个不一致之处。为了解决$Λ$ CDM在小尺度上的问题,已经提出了替代模型,其中最流行的是宇宙中的暗物质由超轻玻色子组成的提议,这是现在的一个强有力的候选者。在这项工作中,我们通过分析的方法研究所产生的后果,面对的标量场暗物质模型的标量目录超重子加速相关。我们进行这样的分析,无论是考虑从结构形成模拟提取的星系晕的功能,或考虑在整个系统中的其他非暗物质元素(如重子或超大质量黑洞)的存在。具体来说,我们解决了最近声称,该模型是不能够复制一个恒定的表面密度的核心相比,观察表明,为主机的星系具有不同的大小和形态。在这个方向上,我们表明,这种差异可以减轻一旦在整个银河系中的无暗物质成分的贡献被考虑在内。此外,我们发现,质量为$m \simeq 1.41 \times 10^{-22}\ eV/c^2$是能够复制我们所有的发现,并正确地调整来自银河系的旋转曲线。

英文摘要:

Although the standard cosmological model, the so-called $Λ$ Cold Dark Matter ("$Λ$CDM"), appears to fit well observations at the cosmological level, it is well known that it possesses several inconsistencies at the galactic scales. In order to address the problems of the $Λ$CDM at small scales, alternative models have been proposed, among the most popular ones the proposal of dark matter in the Universe being made of ultra-light bosons is a strong candidate nowadays. At this work, we study through an analytical approach the consequences arising from confronting the SPARC catalogue observed-baryon acceleration correlation with the scalar field dark matter model. We carry out such analysis either considering the features of galactic haloes extracted from structure formation simulations either from considering the existence of other non-dark-matter elements in the whole system (such as baryons or a supermassive black hole). Specifically, we address a recent claim that the model is not capable of reproducing a constant surface density in the core in contrast to what observations suggest for a host of galaxies with different sizes and morphologies. In this direction, we show that this discrepancy can be alleviated once the contributions of no-dark-matter constituents in the whole galactic system are taken into account. Additionally, we find that a mass of $m \simeq 1.41 \times 10^{-22}\ eV/c^2$ is capable of reproducing all our findings and correctly adjusting the rotation curves coming from the Milky Way galaxy.

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