来自共形或非共形耦合光标量的暗物质遗迹密度
Dark matter relic density from conformally or disformally coupled light scalars
摘要：
热冻结是早期宇宙中暗物质产生机制的一个突出例子，它可以产生稳定的弱相互作用大质量粒子（WIMP）的正确残余密度。在质量尺度的另一端，标准模型的许多流行扩展预测了超轻标量场的存在。这些可以耦合到物质，优先在一个普遍的和移位对称性保持的方式。我们研究的影响，这种共形和非正式耦合的遗迹密度的WIMP，而不引入修改宇宙的热历史。这可能导致额外的热贡献DM遗迹密度或抑制否则太大的丰度相比，观察到的水平。在这项工作中，我们假设WIMP只通过光标量门与标准模型相互作用。我们使用简单的模型的费米子或标量DM，虽然类似的讨论举行了更复杂的情况下，并预测，他们的质量应该是之间的$\sim 100~\textrm{GeV}$和几个$\textrm{TeV}$符合DM丰度和当前的限制耦合的光标量物质在大型强子对撞机。未来的搜索将收紧这些界限。
英文摘要：
Thermal freeze-out is a prominent example of dark matter (DM) production mechanism in the early Universe that can yield the correct relic density of stable weakly interacting massive particles (WIMPs). At the other end of the mass scale, many popular extensions of the Standard Model predict the existence of ultra-light scalar fields. These can be coupled to matter, preferentially in a universal and shift-symmetry-preserving way. We study the impact of such conformal and disformal couplings on the relic density of WIMPs, without introducing modifications to the thermal history of the Universe. This can either result in an additional thermal contribution to the DM relic density or suppress otherwise too large abundances compared to the observed levels. In this work, we assume that the WIMPs only interact with the standard model via the light scalar portal. We use simple models of fermionic or scalar DM, although a similar discussion holds for more sophisticated scenarios, and predict that their masses should be between $\sim 100~\textrm{GeV}$ and several $\textrm{TeV}$ to comply both with the DM abundance and current bounds on the couplings of the light scalars to matter at the LHC. Future searches will tighten these bounds.
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