标题： 通用暗物质晕密度剖面的尺度演化 显示英文标题

标题： Scaling Evolution of Universal Dark-Matter Halo Density Profiles

摘要： 暗物质晕表现出一个普遍的密度剖面，其尺度使得质量较小的系统通常更致密。 这种质量-密度关系由晕的特征密度与晕形成时刻的平均宇宙密度之间的比例关系很好地描述。 最近已经表明，这种比例关系可能是以下简单演化图景的结果。 晕在主要合并中形成，基本上具有相同的基本无量纲剖面，该剖面依赖于宇宙学，并随后由于吸积而从内向外增长。 在这里，我们验证了这一图景的一致性，并表明它能够正确预测质量-密度关系的零点。 显示英文摘要

摘要： Dark-matter halos show a universal density profile with a scaling such that less massive systems are typically denser. This mass-density relation is well described by a proportionality between the characteristic density of halos and the mean cosmic density at halo formation time. It has recently been shown that this proportionality could be the result of the following simple evolutionary picture. Halos form in major mergers with essentially the same, cosmogony-dependent, dimensionless profile, and then grow inside-outside, as a consequence of accretion. Here we verify the consistency of this picture and show that it predicts the correct zero point of the mass-density relation.