论文标题
温暖腐烂的暗物质和哈勃张力
Warm Decaying Dark Matter and the Hubble Tension
论文作者
论文摘要
如果一小部分暗物质是不稳定的，并且在物质辐射平等的时候陷入了黑暗的辐射，则可能会影响宇宙的扩展历史，这有助于减轻哈勃常数的本地测量值之间的长期张力，并根据宇宙微波背景和baryon cosiLlations $ cosillations $ cosimlations $ cossove cosmic coslations $ cosimlations $ cosimlations $ cosimnations $ cosimsolations $ c。但是，如果腐烂的暗物质的这种成分很冷，它将改变重力电位的演变，从而导致与这些相同数据集的不一致。考虑到这一点，我们在这里考虑了腐烂的温暖暗物质的组成部分，其自由流程的长度足以与现有数据保持一致。我们研究温暖衰减暗物质的背景和扰动演变，并使用宇宙学数据来限制这种粒子的质量，丰度和衰减速率。我们发现，温暖腐烂的暗物质的组成部分可以显着减少哈勃常数的局部和宇宙学确定之间的张力。
If a fraction of the dark matter is unstable and decays into dark radiation at around the time of matter-radiation equality, it could impact the expansion history of the universe in a way that helps to ameliorate the long-standing tension between the locally measured value of the Hubble constant and the value inferred from measurements of the cosmic microwave background and baryon acoustic oscillations (assuming standard $Λ$CDM cosmology). If this component of decaying dark matter is cold, however, it will modify the evolution of the gravitational potentials, leading to inconsistencies with these same data sets. With this in mind, we consider here a component of decaying warm dark matter, with a free-streaming length that is long enough to remain consistent with existing data. We study the background and perturbation evolution of warm decaying dark matter, and use cosmological data to constrain the mass, abundance and decay rate of such a particle. We find that a component of warm decaying dark matter can significantly reduce the tension between local and cosmological determinations of the Hubble constant.
