查看FImP奇迹（通过标度不变性）$\acute{\rm a}$ $\rm la$自交互
View FImP Miracle (by Scale Invariance) $\acute{\rm a}$ $\rm la$ Self-interaction
摘要：
将弱相互作用大质量粒子（FIMP）暗物质（DM）与尺度不变性（SI）结合起来，导致极轻的FIMP（因此FImP）与FImP奇迹，即，FImP DM的质量和残余世代具有相同的动力学。在本文中，我们表明，由于FImP的亮度，它，特别是对于标量FImP，可以很容易地容纳大DM自相互作用。对于费米子FImP，如无菌中微子，自相互作用还需要一个介体，它是另一个FImP，一个质量比FImP DM轻或重得多的标量玻色子。DM自我交互为观察FImP（奇迹）打开了一个新的窗口，它不会在传统的DM搜索中留下痕迹。作为一个例子，FImP可以解释最近在星系团Abel 3827中观测到的DM晕质心与星系恒星之间的偏移。
英文摘要：
Combining feebly interacting massive particle (FIMP) dark matter (DM) with scale invariance (SI) leads to extremely light FIMP (thus the FImP) with FImP miracle, i.e., the mass and relic generations of FImP DM share the same dynamics. In this paper we show that due to the lightness of FImP, it, especially for a scalar FImP, can easily accommodate large DM self-interaction. For a fermionic FImP, such as the sterile neutrino, self-interaction additionally requires a mediator which is another FImP, a scalar boson with mass either much lighter or heavier than the FImP DM. DM self-interaction opens a new window to observe FImP (miracle), which does not leave traces in the conventional DM searches. As an example, FImP can account for the offsets between the centroid of DM halo and stars of galaxies recently observed in the galaxy cluster Abel 3827.
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