论文标题
Higgs Portal majoraana fermionic暗物质带有冻结机制
Higgs Portal Majorana Fermionic Dark Matter with the Freeze-in Mechanism
论文作者
论文摘要
我们考虑了一种最小的费米式暗物质模型，其中Majorana Fermion暗物质（DM）$χ$ couples具有标准型号（SM）Higgs field $ h $ 通过较高的术语$ - {\ cal l} \ supset H^\ dagger H \barχ/λ$，其中$λ$是截止比例。我们假设$λ$足够大，以至于在整个宇宙历史上，DM颗粒与SM颗粒的热平衡都不处于热平衡状态。因此，DM颗粒仅由冻结机制产生。通过对冻结机制的数值分析，我们显示了DM遗物丰度的轮廓图，用于DM质量的各种值，加热温度和截止量表。我们从（$m_χ，λ$） - 平面上获得了DM质量的上限和截止比例。我们还考虑了与实验值一致的参数区域的直接DM检测。我们发现，与核子的弹性散射的无自旋横截面低于当前的实验上限。
We consider a minimal model of fermionic dark matter, in which the Majorana fermion dark matter (DM) $χ$ couples with the Standard Model (SM) Higgs field $H$ through a higher-dimensional term $-{\cal L}\supset H^\dagger H \barχχ/Λ$, where $Λ$ is the cutoff scale. We assume that $Λ$ is sufficiently large that DM particles are not in thermal equilibrium with the SM Particles throughout the history of the Universe. Hence, DM particles are produced only by the freeze-in mechanism. Through a numerical analysis of the freeze-in mechanism, we show contour plots of the DM relic abundance for various values of the DM mass, reheating temperature and the cutoff scale. We obtain an upper bound of the DM mass and cutoff scale from contour plots on ($m_χ, Λ$)-plane. We also consider the direct DM detection for the parameter regions where the DM relic abundance is consistent with the experimental values. We find that the spin-independent cross section for the elastic scattering with a nucleon is below the current experimental upper bound.
