论文标题
大型$ n $ -ightmare暗物质
Large $N$-ightmare Dark Matter
论文作者
论文摘要
深色QCD扇区是接纳暗物质（DM）候选者的标准模型（SM）的相对最小的扩展，但不需要对可见扇区的门户超出引力相互作用：DM检测的“噩梦场景”。我们认为一个僻静的黑暗扇区，其中包含单一的光味，类似矢量的深色夸克，以$ su（n）$的含量为单位。在很大程度上，这种单品味理论变得高度预测性，产生了两个DM候选者，它们的质量和动态用很少的参数描述：一个浅夸克 - 易夸克界的状态，$η'$ Meson的深色类似物，以及$ n $ n $ quarks的重型状态，$ n $ Quarks的繁重界限，$Δ^^^^{+++++++++++++++baryon} $ baryon} $ baryon。我们表明，后者可能会独立于限制量表，以$ n \ Lessim 10 $形成类似DM的文物，而前者可以通过蚕丝和冻结产生DM。我们研究了该两组分DM系统的相互作用，并确定限制量表的特征范围，黑暗可见的部门温度比以及$ n $，一旦包括自我交互限制和对BBN和CMB epochs的有效自由度的影响的影响，这些范围允许非排除的DM。
A dark QCD sector is a relatively minimal extension of the Standard Model (SM) that admits Dark Matter (DM) candidates but requires no portal to the visible sector beyond gravitational interactions: A "nightmare scenario" for DM detection. We consider a secluded dark sector containing a single flavor of light, vector-like dark quark gauged under $SU(N)$. In the large-$N$ limit, this single-flavor theory becomes highly predictive, generating two DM candidates whose masses and dynamics are described by few parameters: A light quark-antiquark bound state, the dark analog of the $η'$ meson, and a heavy bound state of $N$ quarks, the dark analog of the $Δ^{++}$ baryon. We show that the latter may freeze-in with an abundance independent of the confinement scale, forming DM-like relics for $N \lesssim 10$, while the former may generate DM via cannibalization and freeze-out. We study the interplay of this two-component DM system and determine the characteristic ranges of the confinement scale, dark-visible sector temperature ratio, and $N$ that admit non-excluded DM, once the effects of self-interaction constraints and bounds on effective degrees of freedom at the BBN and CMB epochs are included.
