论文标题
你闻到腐烂的东西吗？更新有关衰减暗物质方案的线性约束
Do you smell something decaying? Updated linear constraints on decaying dark matter scenarios
论文作者
论文摘要
宇宙汤中颗粒的稳定性是可能影响宇宙进化的重要特性。在这项工作中，当衰减产品有效地无质量时，我们更新对衰减的冷暗物质情景的约束。我们假设作为基本情况，所有暗物质都是不稳定的，并且可以在宇宙学时间尺度上衰减。然后，我们将分析扩展到包括仅一小部分暗物质不稳定的情况，而其余部分则由标准，稳定的暗物质组成。 We consider observations of cosmological probes at linear scales, i.e., Planck 2018 cosmic microwave background temperature, polarization, and lensing measurements, along with geometrical information from baryon acoustic oscillation (BAO) measurements from SDSS DR7, BOSS DR12, eBOSS DR16 and 6dFGS, to derive conservative constraints on the dark matter decay rate.我们将这些数据集分别考虑，以评估每个数据集的相对约束功率，并共同考虑关节约束。我们发现最严格的上限对衰减的冷暗物质颗粒的衰变率为$ \ gammadm <0.129 \ times 10^{ - 18} \，\ Mathrm {s}^{ - 1} $（或等效地，暗物质lifeTime $ \ taudm> taudm> 246 $ gyr）在95 $ \％c.l。为了结合普朗克原发性各向异性，镜头和鲍。我们进一步探讨了基线DCDM模型的一参数扩展。也就是说，我们改变了中微子质量的总和，曲率密度参数和张量比比率以及DCDM参数。在改变张量比比率时，我们还添加了二头肌/凯克实验的数据。
The stability of particles in the cosmic soup is an important property that can affect the cosmic evolution. In this work, we update the constraints on the decaying cold dark matter scenario, when the decay products are effectively massless. We assume, as a base case, that all of dark matter is unstable and it can decay on cosmological time scales. We then extend the analysis to include the scenario where only a fraction of dark matter is unstable, while the remaining part is composed of the standard, stable, dark matter. We consider observations of cosmological probes at linear scales, i.e., Planck 2018 cosmic microwave background temperature, polarization, and lensing measurements, along with geometrical information from baryon acoustic oscillation (BAO) measurements from SDSS DR7, BOSS DR12, eBOSS DR16 and 6dFGS, to derive conservative constraints on the dark matter decay rate. We consider these dataset separately, to asses the relative constraining power of each dataset, as well as together to asses the joint constraints. We find the most stringent upper limit on the decay rate of decaying cold dark matter particles to be $\Gammadm < 0.129 \times 10^{-18}\,\mathrm{s}^{-1}$ (or, equivalently, the dark matter lifetime $\taudm > 246$ Gyr) at 95\% C.L. for the combination of Planck primary anisotropies, lensing and BAO. We further explore one-parameter extensions of our baseline DCDM model. Namely, we vary the sum of neutrino masses, the curvature density parameter, and the tensor-to-scalar ratio along with the DCDM parameters. When varying the tensor-to-scalar ratio we also add data from the BICEP/Keck experiment.
