论文标题
MEV暗物质，Abelian动力学混合理论中的Mev Dark Photon
MeV Dark Matter with MeV Dark Photons in Abelian Kinetic Mixing Theories
论文作者
论文摘要
我们将深色光子门户的宇宙学和现象学考虑到一个简单的黑暗扇区，该黑暗扇区由单一的，光明的，费米子的暗物质粒子物种组成，其质量在MEV范围内。我们在新的Abelian Gauge组U（1）$ _ {\ text {dark}} $与可见扇区通过U（1）$ _ {\ text {我们假设深色光子是庞大的，并且围绕MEV量表，因此接近候选暗物质的质量尺度。我们通过冻结和冷冻输入来计算深色物质遗物密度，并为（i）通货膨胀时期的其他可能性稀释了沉重候选者的暗物质产量，以及（ii）额外的生产模式，对于量不足的热量产生。我们探索与各种实验和天体物理界限兼容的参数空间，并使用新的CMB探针和MEV Gamma-ray望远镜讨论发现的前景。
We consider the cosmology and phenomenology of a dark photon portal to a simple dark sector consisting of a single, light, fermionic dark matter particle species with mass in the MeV range. We entertain three possible kinetic mixing structures of a new Abelian gauge group U(1)$_{\text{dark}}$ with the visible sector through U(1)$_{\text{e.m.}}$, U(1)$_{\text{Y}}$ and T[SU(2)$_{\text{L}}$]. We assume the dark photon to be massive and around the MeV scale, thus close to the mass scale of the dark matter candidate. We compute the dark matter relic density via freeze-out and freeze-in, entertaining the additional possibilities of (i) a late inflationary period that could dilute the dark matter yield of heavy candidates, and (ii) additional production modes, for models with under-abundant thermal production. We explore the parameter space compatible with a variety of experimental and astrophysical bounds, and discuss prospects for discovery with new CMB probes and MeV gamma-ray telescopes.
