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arXiv 1410.2256astro-ph.GA
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银河系自转曲线、重子-暗晕质量关系和时空标度不变性

Galactic rotation curves, the baryon-to-dark-halo-mass relation and space-time scale invariance

Xufen Wu, Pavel Kroupa

摘要:

低加速度时空尺度不变动力学(SID,Milgrom 2009 a)预测了从观测星系动力学中已知的两个基本相关性:重子Tully-Fisher关系(BTFR)和在盘星系的低加速度区域中观测到的质量差异和加速度之间的相关性(MDA)。SID对应于深度调制牛顿动力学(MOND)极限。冷/暖暗物质(C/WDM)宇宙学模拟中出现的MDA数据与观测星系的紧密MDA相关性显着不一致。因此,在标准暗物质宇宙学模型中,最现代的模拟盘状星系被精心挑选,具有安静的合并历史,仍然不能代表正确的旋转曲线。此外,所观察到的紧密相关矛盾的假设随机形成的星系在低质量DM晕。此外,我们发现,SID预测重子表观维里晕(暗物质)的质量关系,这与相关推导观测假设牛顿动力学是有效的,而重子晕质量关系预测CDM模型不同意。观测到的暗物质晕质量与重子质量之比的分布可能是外场效应的经验证据,这是SID中预测的两个星系之间的作用力取决于第三个星系的位置和质量的结果。应用外场效应,我们预测了Miller等人样本中矮星系附近星系的质量。因此,经典的非相对论性引力动力学最好被描述为米尔格罗米氏动力学,而不是牛顿动力学。

英文摘要:

Low-acceleration space-time scale invariant dynamics (SID, Milgrom 2009a) predicts two fundamental correlations known from observational galactic dynamics: the baryonic Tully-Fisher relation (BTFR) and a correlation between the observed mass discrepancy and acceleration (MDA) in the low acceleration regime for disc galaxies. SID corresponds to the deep MOdified Newtonian Dynamics (MOND) limit. The MDA data emerging in cold/warm dark matter (C/WDM) cosmological simulations disagree significantly with the tight MDA correlation of the observed galaxies. Therefore, the most modern simulated disc galaxies, which are delicately selected to have a quiet merging history in a standard dark-matter-cosmological model, still do not represent the correct rotation curves. Also, the observed tight correlation contradicts the postulated stochastic formation of galaxies in low-mass DM halos. Moreover, we find that SID predicts a baryonic to apparent virial halo (dark matter) mass relation which agrees well with the correlation deduced observationally assuming Newtonian dynamics to be valid, while the baryonic to halo mass relation predicted from CDM models does not. The distribution of the observed ratios of dark-matter halo masses to baryonic masses may be empirical evidence for the external field effect, which is predicted in SID as a consequence of the forces acting between two galaxies depending on the position and mass of a third galaxy. Applying the external field effect, we predict the masses of galaxies in the proximity of the dwarf galaxies in the Miller et al. sample. Classical non-relativistic gravitational dynamics is thus best described as being Milgromian, rather than Newtonian.

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