论文标题
粘性深色能模型中的全局21厘米亮度温度
Global 21-cm brightness temperature in viscous dark energy models
论文作者
论文摘要
我们在粘性暗能量（VDE）模型的背景下研究了全局21厘米的亮度温度。深色能量的散装粘度散发出宇宙的哈勃演化，该宇宙可以更快地冷却重子，因此改变了21厘米的亮度温度。作为粘性流的结果，还会产生额外的熵。我们研究了VDE模型的背景下粒子暗物质和bary式黑物和baryon-dark物质散射的原始黑洞的鹰辐射的综合贡献，以修饰21 cm温度。我们在VDE模型参数上获得界限，该参数可以说明边缘实验的观察过量（$ -500^{+200} _ { - 500} $ MK，由于上述效果的相互作用，Redshift $ 14 <z <20 $）。此外，与$λ$ CDM模型相比，我们的分析对暗物质质量和散射横截面产生了修改的约束。
We investigate the global 21-cm brightness temperature in the context of viscous dark energy (VDE) models. The bulk viscosity of dark energy perturbs the Hubble evolution of the Universe which could cool baryons faster, and hence, alter the 21-cm brightness temperature. An additional amount of entropy is also produced as an outcome of the viscous flow. We study the combined contribution of Hawking radiation from primordial black holes, decay and annihilation of particle dark matter and baryon-dark matter scattering in the backdrop of VDE models towards modification of the 21-cm temperature. We obtain bounds on the VDE model parameters which can account for the observational excess of the EDGES experiment ($-500^{+200}_{-500}$ mK at redshift $14<z<20$) due to the interplay of the above effects. Moreover, our analysis yields modified constraints on the dark matter mass and scattering cross-section compared to the case of the $Λ$CDM model.
