论文标题
部分可观测时空混沌系统的无模型预测
Limit on the dark matter mass from its interaction with photons
论文作者
论文摘要
在这项工作中，我们探讨了与光子相互作用（$γ$）相互作用的广义暗物质（GDM）的现象学。我们认为，当DM已经变得非依赖主义时，DM可以用$γ$建立弹性散射，否则当前的观察结果将不利于当今的DM。在这种情况下，DM的状态（EOS）方程取决于其质量（$M_χ$）和DM- $γ$散射横截面。 CMB Angular Power Spectrum上非零EOS的独特烙印使我们仅使用Planck 2018 Data（即$M_χ> 8.7 $ keV）设置$m_χ$的下限，以$ 95 \％\％$ c.l.在研究宇宙和解问题的研究中，我们发现GDM场景保留了信托$λ$ CDM型号中预测的声音范围（$ r_s（z _*）$），因此无法解决$ h_0 $张力。当执行Planck+LSS数据集的联合分析时，最佳拟合$ s_8 = 0.785 \ pm 0.017 $与给定的$ S_8 $匹配。这表明GDM方案可以被视为可行的候选人，以还原$ s_8 $（$σ_{8} $）张力。
In this work, we explore the phenomenology of generalized dark matter (GDM) which interacts with photons ($γ$). We assume that DM establishes elastic scattering with $γ$ when it has already become nonrelativistic, otherwise the abundance of DM today is disfavored by current observations. Within this scenario, the equation of state (EoS) of DM is determined by its mass ($m_χ$) and the DM-$γ$ scattering cross-section. The distinctive imprints of a nonzero EoS of DM on CMB angular power spectrum allow us to set a lower limit on $m_χ$ with Planck 2018 data alone, i.e., $m_χ > 8.7$ keV at $95\%$ C.L. In the study of cosmic concordance problems, we find that the GDM scenario preserves the sound horizon ($r_s(z_*)$) predicted in the fiducial $Λ$CDM model, and thus does not solve the $H_0$ tension. When performing the joint analysis of Planck+LSS datasets, the best-fit $S_8= 0.785\pm 0.017$ closely matches the given $S_8$ prior. This suggests that the GDM scenario can be counted as a viable candidate to restore the $S_8$ ($σ_{8}$) tension.
