星系尺度下MOND暗物质存在的必要性
The necessity of dark matter in MOND within galactic scales
摘要：
为了进一步测试银河系尺度上的修正牛顿动力学（MOND）--最初提出来解释没有暗物质的盘星系的旋转曲线--我们研究了CASTLES数据库中六个强引力透镜早型星系的样本。为了确定这些星系中是否存在暗物质，我们将总质量（来自透镜效应）与恒星质量含量（来自测光和恒星星族合成的比较）进行比较。我们发现，星系尺度上的强引力透镜需要大量的暗物质，即使在MOND。在这样的尺度上，2 eV的中微子无法解释这种多余的物质-与最近解释子弹状星系团透镜数据的说法相反。暗物质的存在被检测到的区域具有更高的加速度比$\sim 10^{-10}$ m/s $^2$的特征MONDian规模。这对MOND来说是一个严重的挑战，除非对透镜效应的正确处理有质的不同（可能是在一个一致的理论中发展，如TeVeS）。
英文摘要：
To further test MOdified Newtonian Dynamics (MOND) on galactic scales -- originally proposed to explain the rotation curves of disk galaxies without dark matter -- we study a sample of six strong gravitational lensing early-type galaxies from the CASTLES database. To determine whether dark matter is present in these galaxies, we compare the total mass (from lensing) with the stellar mass content (from a comparison of photometry and stellar population synthesis). We find that strong gravitational lensing on galactic scales requires a significant amount of dark matter, even within MOND. On such scales a 2 eV neutrino cannot explain this excess matter -- in contrast with recent claims to explain the lensing data of the bullet cluster. The presence of dark matter is detected in regions with a higher acceleration than the characteristic MONDian scale of $\sim 10^{-10}$m/s$^2$. This is a serious challenge to MOND unless the proper treatment of lensing is qualitatively different (possibly to be developed within a consistent theory such as TeVeS).
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