Considering the dark matter as self-gravitating Bose-Einstein condensate in a gravito-chemical equilibrium state, we have studied the light trajectory through the halo. Found that depending on the initial direction cosine of the light ray, there are three types of trajectories: (a) the refracted light i.e. light which can refracts away from the halo to the out side, (b) the trapped light i.e. light that is trapped into the halo i.e. an observer, situated outside of the halo, can not observe it and (c) the reflected light: in this case the halo behaves as a perfect reflector to the outside light. The light trapping can introduce asymmetry in the observed spectrum and modify the apparent number of stars in a dark matter dominated galaxy.

中文翻译：

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暗物质捕获光

考虑到暗物质是处于引力化学平衡状态的自引力玻色-爱因斯坦凝聚物，我们研究了光通过晕圈的轨迹。发现根据光线的初始方向余弦，存在三种类型的轨迹：(a) 折射光，即可以从光晕向外折射的光，(b) 被困光，即被被困在光晕中，即位于光晕外部的观察者无法观察到它和 (c) 反射光：在这种情况下，光晕表现为对外部光的完美反射。光捕获可以在观察到的光谱中引入不对称性，并改变暗物质主导星系中恒星的表观数量。