Absence of a fundamental acceleration scale in galaxies
Absence of a fundamental acceleration scale in galaxies
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DOI：
10.1038/s41550-018-0498-9
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发表时间：
2018-06
期刊：
影响因子：
14.1
通讯作者：
D. Rodrigues;V. Marra;A. Del Popolo;Zahra Davari
中科院分区：
文献类型：
--
作者：
D. Rodrigues;V. Marra;A. Del Popolo;Zahra Davari
暗物质是目前宇宙的主要奥秘之一。有许多强有力的间接证据支持它的存在，但还没有直接探测的迹象。此外，在星系尺度上，理论上预期的暗物质分布与间接观测到的暗物质分布之间存在着张力。因此，与暗物质相关的现象有机会成为新物理学的窗口。径向加速度关系，证实了一个非平凡的加速度标度a0可以从几个星系的内部动力学。就标准宇宙学模型而言，这种尺度的存在并不明显，它被解释为引力修正的可能标志。在这里，我们考虑了193个高质量的盘星系，并使用贝叶斯推断，表明基本加速度存在的概率基本上是0：零假设被拒绝超过10σ。我们得出结论，a0是涌现性的。特别是，修正的牛顿动力学理论，--一个众所周知的替代暗物质的基础上存在的基本加速度标度--或任何其他理论，行为类似于它在星系尺度，被排除作为一个基本理论的星系在10σ以上。
Dark matter is currently one of the main mysteries of the Universe. There is much strong indirect evidence that supports its existence, but there is yet no sign of a direct detection, –. Moreover, at the scale of galaxies, there is tension between the theoretically expected dark matter distribution and its indirectly observed distribution, , –. Therefore, phenomena associated with dark matter have a chance of serving as a window towards new physics. The radial acceleration relation,confirms that a non-trivial acceleration scalea0can be found from the internal dynamics of several galaxies. The existence of such a scale is not obvious as far as the standard cosmological model is concerned,, and it has been interpreted as a possible sign of modified gravity,. Here, we consider 193 high-quality disk galaxies and, using Bayesian inference, show that the probability of existence of a fundamental acceleration is essentially 0: the null hypothesis is rejected at more than 10σ. We conclude thata0is of emergent nature. In particular, the modified Newtonian dynamics theory, , –—a well-known alternative to dark matter based on the existence of a fundamental acceleration scale—or any other theory that behaves like it at galactic scales, is ruled out as a fundamental theory for galaxies at more than 10σ.