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arXiv 2005.04146hep-ph
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相互作用多组分暗扇区的唯象结果

Phenomenological consequences of an interacting multicomponent dark sector

Jan Tristram Acuña, Marco Fabbrichesi, Piero Ullio

摘要:

我们考虑一个暗扇形模型,该模型包含在不间断的$U(1)$规范相互作用下带电的稳定费米子,以无质量暗光子为力载体,通过标量信使与普通物质相互作用。我们通过求解一组耦合的玻尔兹曼方程来研究它的早期宇宙演化,这些方程跟踪不同物种的数量密度,以及暗区和可见区之间的熵和能量交换。现象学上可行的实现包括:i)重的(1 TeV或更高)轻子样暗费米子扮演暗物质候选者的角色,根据暗可见扇区门户的强度,各种生产机制活跃; ii)光(几个GeV到几十个GeV)类夸克暗费米子,稳定但具有抑制的残余密度; iii)由于暗光子,宇宙中的额外辐射成分,温度受宇宙微波背景数据的限制,从而防止暗费米子轻于约1 GeV。对我们的方案的额外限制来自暗物质直接探测搜索:原子核上的弹性散射是由标准模型或暗光子介导的偶极或电荷半径相互作用驱动的,提供了长程效应,然而,并不总是占主导地位,正如通常在这种情况下假设的那样。下一代探测器的预计灵敏度覆盖了可行参数空间的重要部分,并且相对于从轻子的磁偶极矩和恒星系统的冷却导出的依赖于模型的约束具有竞争力。

英文摘要:

We consider a dark sector model containing stable fermions charged under an unbroken $U(1)$ gauge interaction, with a massless dark photon as force carrier, and interacting with ordinary matter via scalar messengers. We study its early Universe evolution by solving a set of coupled Boltzmann equations that track the number density of the different species, as well as entropy and energy exchanges between the dark and visible sectors. Phenomenologically viable realizations include: i) a heavy (order 1 TeV or more) lepton-like dark fermion playing the role of the dark matter candidate, with various production mechanisms active depending on the strength of the dark-visible sector portal; ii) light (few GeV to few tens of GeV) quark-like dark fermions, stable but with suppressed relic densities; iii) an extra radiation component in Universe due to dark photons, with temperature constrained by cosmic microwave background data, and in turn preventing dark fermions to be lighter than about 1 GeV. Extra constraints on our scenario stem from dark matter direct detection searches: the elastic scattering on nuclei is driven by dipole or charge radius interactions mediated by either Standard Model or dark photons, providing long-range effects which, however, are not always dominant, as usually assumed in this context. Projected sensitivities for next-generation detectors cover a significant portion of the viable parameter space and are competitive with respect to the model-dependent constraints derived from the magnetic dipole moments of leptons and cooling of stellar systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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