Looking for the WIMP next door
Looking for the WIMP next door
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DOI：
10.1007/jhep02(2018)100
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发表时间：
2018-02
影响因子：
5.4
通讯作者：
J. Evans;S. Gori;J. Shelton
中科院分区：
文献类型：
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作者：
J. Evans;S. Gori;J. Shelton
我们全面研究了一类最小隐藏扇区暗物质（DM）模型的实验约束和前景，突出了这些模型的宇宙学历史如何通知实验信号。我们研究简单的“隔离”模型，其中DM冻结成不稳定的暗介质状态，并考虑这个黑暗的部门，耦合的暗介质的SM足以保持两个部门在早期的热平衡的最小宇宙历史。在动机良好的情况下，暗介质耦合到标准模型（SM）通过重正化的相互作用，热平衡的要求提供了一个最小的，紫外线不敏感的，和预测的宇宙学隐藏的部门暗物质。我们呼吁DM冻结出一个黑暗的辐射浴中的热平衡与SM的WIMP隔壁，并证明了这样的WIMP隔壁的参数空间是明确定义的，有界的，并在很大程度上潜在的访问。这个参数空间，以及相应的信号，取决于SM和暗介质之间的主导相互作用，我们建立了希格斯粒子和矢量门户相互作用。特别是，有一个宇宙学下限的门户耦合强度必要热化的两个部门在早期宇宙。我们确定这个热化地板作为平衡温度的函数的第一次。我们表明，直接检测实验目前正在探索这个宇宙学的下限在某些地区的参数空间，而间接检测信号和地面搜索的调解人进一步切入可行的参数空间。我们目前的直接检测和暗介质搜索的兴趣区域，包括动机的参数空间的直接检测亚GeV DM。
We comprehensively study experimental constraints and prospects for a class of minimal hidden sector dark matter (DM) models, highlighting how the cosmological history of these models informs the experimental signals. We study simple ‘secluded’models, where the DM freezes out into unstable dark mediator states, and consider the minimal cosmic history of this dark sector, where coupling of the dark mediator to the SM was sufficient to keep the two sectors in thermal equilibrium at early times. In the well-motivated case where the dark mediators couple to the Standard Model (SM) via renormalizable interactions, the requirement of thermal equilibrium provides a minimal, UV-insensitive, and predictive cosmology for hidden sector dark matter. We call DM that freezes out of a dark radiation bath in thermal equilibrium with the SM a WIMP next door, and demonstrate that the parameter space for such WIMPs next door is sharply defined, bounded, and in large part potentially accessible. This parameter space, and the corresponding signals, depend on the leading interaction between the SM and the dark mediator; we establish it for both Higgs and vector portal interactions. In particular, there is a cosmological lower bound on the portal coupling strength necessary to thermalize the two sectors in the early universe. We determine this thermalization floor as a function of equilibration temperature for the first time. We demonstrate that direct detection experiments are currently probing this cosmological lower bound in some regions of parameter space, while indirect detection signals and terrestrial searches for the mediator cut further into the viable parameter space. We present regions of interest for both direct detection and dark mediator searches, including motivated parameter space for the direct detection of sub-GeV DM.