AI 中文总结
本研究提出一种机制，利用马约拉纳暗物质与有色标量伙伴的模型，通过重子不对称性的后期传递，结合耦合玻尔兹曼方程求解，可重现观测到的暗物质遗迹丰度，且LHC对重长寿命粒子的搜索可约束其部分参数空间。
AI 中文摘要
我们提出一种机制，其中原初重子不对称性通过一个更重的伙伴部门决定自共轭暗物质的遗迹丰度。在包含一个马约拉纳费米子χ和一个有色标量伙伴q~的简化模型中，QCD湮灭会耗尽对称伙伴的粒子群，而残留的不对称成分作为临时储备保留下来。对于微弱的门户耦合，该不对称性会在暗物质退耦后的后期传递给χ。最终的遗迹丰度由残留不对称性的量、传递的时间点以及后续的暗物质湮灭控制。通过求解包含相关化学势效应的耦合玻尔兹曼方程，我们发现门户耦合的中间范围可以在不需要压缩质量谱的情况下重现观测到的遗迹丰度。该定性机制对质量层级、暗物质湮灭模式和轻子不对称性的变化具有鲁棒性。微弱的门户耦合也使得有色伙伴可能具有长寿命，从而允许通过大型强子对撞机（LHC）寻找重长寿命粒子来约束部分可行的参数空间。
英文摘要
We propose a mechanism in which a primordial baryon asymmetry determines the relic abundance of self-conjugate dark matter through a heavier partner sector. In a simplified model with a Majorana fermion $χ$ and a colored scalar partner $\tilde q$, QCD annihilations deplete the symmetric partner population while a residual asymmetric component survives as a temporary reservoir. For feeble portal couplings, this asymmetry is transferred to $χ$ at late times, after dark matter freeze-out. The final relic abundance is controlled by the amount of surviving asymmetry, the timing of its transfer, and the subsequent dark matter annihilation. Solving the coupled Boltzmann equations with the relevant chemical-potential effects, we find that an intermediate range of portal couplings can reproduce the observed relic abundance without requiring a compressed mass spectrum. The qualitative mechanism remains robust against variations in the mass hierarchy, dark matter annihilation mode, and lepton asymmetry. The small portal couplings also make the colored partner potentially long lived, allowing LHC searches for heavy long-lived particles to constrain part of the viable parameter space.
Comments32 pages, 9 figures
