AI 中文总结
提出“暗凤凰”机制解决暗物质遗迹问题，依赖暗物质冻结后的短暂衰变窗口，通过有限温度下质量变化及一阶相变使暗物质衰变适度，带电标量有有趣对撞机特征，相关相变或产生可观测引力波。
AI 中文摘要
我们提出了一种生成正确暗物质遗迹的新机制，否则通过传统的冻结机制暗物质会热产生过量。这种被称为“暗凤凰”的机制依赖于暗物质冻结后一个短暂的衰变窗口，使遗迹在观测范围内。由于有限温度对质量的影响，在此窗口中暗物质ψ比其暗区伙伴ϕ重，从而允许其衰变。当由另一个标量η驱动的一阶相变使ϕ质量突然跃升后，暗物质的衰变停止。假设暗区伙伴ϕ是带电标量，在此时期经历足够的对湮灭，使得其后期衰变成暗物质不会再次产生过量。虽然由于耦合小暗物质的直接探测率仍被抑制，但带电标量ϕ在对撞机上可有如长寿命带电径迹等有趣特征。相关的一阶相变在未来如LISA的实验中也可导致可观测的引力波。
英文摘要
We propose a novel mechanism for generating correct relic of dark matter (DM) which otherwise gets thermally overproduced from the conventional freeze-out mechanism. The mechanism, dubbed as {\it Dark Phoenix}, relies on a transient decay window for DM after its freeze-out which brings its relic within observed limits. Due to finite-temperature effects on masses, DM $ψ$ becomes heavier than its dark sector partner $ϕ$ in this window allowing it to decay. The decay of DM then stops after $ϕ$ gets a sudden jump in its mass from a first-order phase transition (FOPT) driven by another scalar $η$. The dark sector partner $ϕ$, assumed to be a charged scalar, undergoes sufficient pair annihilation during this epoch such that its late decay into DM does not overproduce the latter again. While direct-detection rates of DM remains suppressed due to small couplings, the charged scalar $ϕ$ can have interesting signatures like long-lived charged track at colliders. The associated FOPT can also lead to observable gravitational waves at future experiments like LISA.
Comments11 pages, 8 captioned figures
