论文标题
衰减的暗物质和lyman- $α$森林约束
Decaying Dark Matter and Lyman-$α$ forest constraints
论文作者
论文摘要
衰减的冷暗物质（DCDM）是目前正在研究的模型，主要是关于宇宙微波背景（CMB）和某些大规模结构测量的$ S_8 $张力。腐烂成一个巨大和一个（或更多）无质量的子女粒子，导致抑制晚期宇宙中的功率谱，这取决于母亲和大型女儿粒子之间的相对质量分裂$ε=（1-m^2/m^2）/2 $，以及生命周期$τ$。在这项工作中，我们使用保守的有效模型方法来说明天体物理不确定性，研究BOSS DR14一维Lyman-$ lyman- $α$ forest Flux Power Spectrum的影响。由于在低红移处抑制了由于衰减而产生的功率谱，因此我们发现，要解决$ s_8 $张力的参数空间中的区域与Lyman-$ lyman-$α$ Forest兼容。然而，对于退化参数的值$ε\ sim 0.1-0.5 \％$，为此，在Boss Lyman- $α$数据探索的量表中，功率抑制作用，我们发现与以前的CMB和Galaxy Compuster分析相比，我们发现了改进的约束，并获得了$ $最$最大的$ gtrsim $ gyrs $ gyrs symbles small splate。此外，我们对Boss Lyman- $α$通量功率谱的分析允许$τ\ sim 10^2 $ gyrs，$ε\ sim 1 \％$，这是普普兰克和Galaxy Compuster与孩子们在$ s_8 $和我们的$ s_8 $和我们的Margical Precerpercrime of Margical Prederpercrime of Planck和Galaxy Cluster Compluster Compluste contermint of Planck和Galaxy Cluster Compluster conterime of Margical Precermime of Margical Precermime''中所偏爱的。
Decaying Cold Dark Matter (DCDM) is a model that is currently under investigation regarding primarily the $S_8$ tension between cosmic microwave background (CMB) and certain large-scale structure measurements. The decay into one massive and one (or more) massless daughter particle(s) leads to a suppression of the power spectrum in the late universe that depends on the relative mass splitting $ε=(1-m^2/M^2)/2$ between the mother and massive daughter particle as well as the lifetime $τ$. In this work we investigate the impact of the BOSS DR14 one-dimensional Lyman-$α$ forest flux power spectrum on the DCDM model using a conservative effective model approach to account for astrophysical uncertainties. Since the suppression of the power spectrum due to decay builds up at low redshift, we find that regions in parameter space that address the $S_8$ tension can be well compatible with the Lyman-$α$ forest. Nevertheless, for values of the degeneracy parameter $ε\sim 0.1-0.5\%$, for which the power suppression occurs within the scales probed by BOSS Lyman-$α$ data, we find improved constraints compared to previous CMB and galaxy clustering analyses, obtaining $τ\gtrsim 18$ Gyrs for small mass splitting. Furthermore, our analysis of the BOSS Lyman-$α$ flux power spectrum allows for values $τ\sim 10^2$ Gyrs, $ε\sim 1\%$, that have been found to be preferred by a combination of Planck and galaxy clustering data with a KiDS prior on $S_8$, and we even find a marginal preference within this regime.
