论文标题
暗物质遗物密度从共同或异性耦合的光标量
Dark matter relic density from conformally or disformally coupled light scalars
论文作者
论文摘要
热冻结是早期宇宙中暗物质（DM）生产机制的重要例子，可以产生稳定弱相互作用的巨大颗粒（WIMP）的正确遗物密度。在质量尺度的另一端，标准模型的许多流行扩展预测了超光标度磁场的存在。这些可以以通用和偏移对称的方式优先耦合到重要的情况下。我们研究了这种保形耦合对wimp的遗物密度的影响，而无需对宇宙的热历史进行修改。与观察到的水平相比，这可能会导致对DM遗物密度的额外热贡献，或者抑制过多的丰度。在这项工作中，我们假设WIMP仅通过光标量门户与标准模型进行交互。我们使用简单的费米或标量DM模型，尽管对更复杂的场景也有类似的讨论，并预测它们的质量应在$ \ sim 100〜 \ textrm {gev} $和几个$ \ textrm {tev} $之间，以兼容dm的丰富性和电流的范围，并在lime sceplings couplings couplans couplings coupling coupling coupling couplans coupling coupling coupling coupling。未来的搜索将收紧这些界限。
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.
