标题： 引力微透镜：探测晕暗物质的方法 显示英文标题

标题： Gravitational microlensing: a method for detecting halo dark matter

摘要： Paczyński已经证明，如果暗物质的质晕的质量位于大约$10^{-6} < M/M_{\odot} < 10^{-1}$的范围内，引力微透镜效应可能是探测我们星系质晕中暗物质成分的一个有用方法。目前正在进行的微透镜观测正在监测大麦哲伦云和银河系bulge中的数百万颗恒星。在这里，我讨论了微透镜事件的主要特征：特别是它们的发生率和概率，并且还考虑到了质晕可能扁平化的形状。 显示英文摘要

摘要： It has been shown by Paczy\'nski that gravitational microlensing is potentially a useful method for detecting the dark constituents of the halo of our galaxy, if their mass lies in the approximate domain $10^{-6} < M/M_{\odot} < 10^{-1}$. Microlensing observations now under way monito several millions of stars in the Large Magellanic Cloud and in the Galactic Bulge. Here I discuss the main features of the microlensing events: in particular their rates and probability, taking also into account a possible flattened shaper for the halo.