论文标题
MEV规模的烙印在Planck数据中隐藏了黑暗区域
Imprints of MeV Scale Hidden Dark Sector at Planck Data
论文作者
论文摘要
新的光种可以有助于有效的相对论自由度（$ n _ {\ rm eff} $）在宇宙微波背景（CMB）的数量，这是由普朗克精确衡量的。在这项工作中，我们考虑了MEV量表热脱钩的非最小黑暗区域，并研究了CMB组时$ n _ {\ rm eff} $的测量中暗区动力学的烙印。我们已经根据$ n _ {\ rm eff} $的测量结果和planck的暗物质遗物密度来预测模型参数空间的允许区域。事实证明，在黑暗扇区颗粒的非层次质量谱的情况下，暗区动力学对$ n _ {\ rm eff} $的影响很重要。
New light species can contribute to the number of effective relativistic degrees of freedom ($N_{\rm eff}$) at Cosmic Microwave Background (CMB) which is precisely measured by Planck. In this work, we consider an MeV scale thermally decoupled non-minimal dark sector and study the imprint of the dark sector dynamics on the measurement of $N_{\rm eff}$ at the time of CMB formation. We have predicted the allowed region of model parameter space in the light of constraints arising from the measurements of both $N_{\rm eff}$ and dark matter relic density by Planck. It turns out that the impact of the dark sector dynamics on $N_{\rm eff}$ is significant in case of a non-hierarchical mass spectrum of the dark sector particles.
